| Novosti nauki | |
| The R.A.P. Project | |
| 25.01.10. astro-ph za 20 - 24 yanvarya 2002 goda: izbrannye stat'i | |
|
Authors: Sebastien Lepine et al.
Authors: Weidong Li et al.
Authors: H. Ritter, U. Kolb
Authors: A. Ringwald
Authors: G.Sironi et al. Commets: 9 pages, in press on the Proc. of the 3rd Sakharov Conf. - Moscow 2002 Opisyvayutsya predvaritel'nye rezul'taty eksperimenta TRIS po poisku otklonenii ot plankovskogo spektra na chastote poryadka 1 Ggc.
Authors: A. Jorissen, M. Dedecker, B. Plez, D. Gillet, A. Fokin Commets: 8 pages, 6 figures. To appear in 'Journees Miras 2002', edited by M.O. Mennessier et al., Universite de Montpellier-II (2003). Also available at http://www-astro.ulb.ac.be/Html/ps.html#Tomo Korrelyaciya spektra zvezdy s cifrovoi maskoi sinteticheskogo spektra pozvolyaet vydelit' v ee atmosfere sloi s povyshennoi svetimost'yu i/ili plotnost'yu. Metod pozvolyaet obnaruzhivat' udarnye fronty v atmosfere. Obsuzhdayutsya rezul'taty poluchennye dlya peremennyh zvezd RT Cyg i RY Cep otnosyashihsya k Miridam.
Authors: Roger A. Chevalier Commets: 10 pages, to appear in Proc. "From Twilight to Highlight - The Physics of Supernovae" ESO/MPA/MPE Workshop, Garching July 2002
Sverhnovye vzryvayutsya ne v pustote. Vo-pervyh est' mezhzvezdnoe veshestvo, a
vo-vtoryh massivnaya zvezda imeet moshnyi veter.
T.o. dlya togo, chtoby ponyat', kak formiruyutsya ostatki sverhnovyh, neobhodimo
uchityvat' "blizhaishee okruzhenie" vzryvayusheisya zvezdy.
V nebol'shom obzore avtor rassmatrivaet razlichnye tipy sverhnovyh, svyazannye
s massivnymi zvezdami s tochki zreniya ih vzaimodeistviya s okolozvezdnym
veshestvom.
Authors: S. E. Woosley, A. Heger Commets: 12 pages, 2 figures, to appear in Proc. IAU 215 "Stellar Rotation"
Raschety sverhnovyh stanovyatsya vse bolee i bolee prodvinutymi.
Teper' v standartnoi modeli vzryva nauchilis' uchityvat' vrashenie.
Ob etom i idet rech' v dannom korotkom obzore. Takzhe rassmatrivaetsya svyaz'
sverhnovyh s gamma-vspleskami.
Authors: A. Heger et al. Commets: 10 pages, 2 figures, to appear in Proc. IAU 215 "Stellar Rotation" Eta stat'ya samym neposredstvennym obrazom svyazana s predydushei, no eto ne obzor, a original'naya rabota dvuh grupp, ob'edinivshih svoi usiliya, dlya togo chtoby razobrat'sya s nachal'nym tempom vrasheniya neitronnyh zvezd. V itoge poluchayutsya dostatochno bystrovrashayushiesya neitronnye zvezdy: bez magnitnogo polya odni gidrodinamicheskie neustoichivosti i konvekciya ne mogut otodvinut' novorozhdennyi pul'sar ot vrasheniya na predele razrusheniya. Vliyanie magnitnogo polya uvelichivaet nachal'nyi period na poryadok (do 4-7 millisekund). V poslednem sluchae energii vrasheniya okazyvaetsya nedostatochno dlya togo, chtoby "zapitat'" gamma-vsplesk v modeli kollapsara. Odnako, "mnogoe sdelano, no mnogoe eshe predstoit". V chastnosti, v tesnyh dvoinyh sistemah situaciya mozhet sushestvenno otlichat'sya kak v tu, tak i v inuyu storonu.
Authors: Sebastien Lepine et al. Commets: 7 pages, 1 table, 3 figures, Ssbmitted to the Astrophysical Journal Letters V hode obzora zvezd s vysokim sobstvennym dvizheniem otkryt samyi holodnyi subkarlik. Zvezda otnesena k spektral'nomu klassu sdM8.0 (temperatura zdes' "zalozhena" v spektral'nom klasse, potomu ne govoryat "otkryt samyi holodnyi karlik s temperaturoi ..."). Rasstoyanie do zvezdy 65+/-15 parsek. Massa okolo 0.09 mass Solnca. Vozmozhno, eta zvezda yavlyaetsya ob'ektom galo! Obnaruzhenie takogo istochnika vsego v 65 pk ot Solnca govorit o tom, chto v Galaktike ih dolzhno byt' ochen' mnogo.
Authors: Ralf S. Klessen Commets: 33 pages, incl. 11 figures, to appear in Reviews of Modern Astronomy, Vol. 16 (high-resolution version at http://www.aip.de/~ralf/Publications/r01.abstract.html) Sovremennye raschety i nablyudeniya pokazyvayut, chto dlya processa formirovaniya zvezd turbulentnost' okazyvaetsya vazhnee mnogih drugih faktorov (naprimer, vazhnee magnitnogo polya). V obzore podrobno rassmatrivaetsya vliyanie sverhzvukovoi turbulentnosti na zvezdoobrazovanie. Upor delaetsya v osnovnom na teoriyu, a ne na nablyudeniya.
Authors: Boris E. Stern Commets: 12 pages, submitted to MNRAS Na proshloi nedele my uzhe upominali ob etoi rabote, rasskazyvaya o rabote Derisheva i dr.. Ideya zaklyuchaetsya v tom, chto v ul'trarelyativistskih udarnyh volnah (kotorye mogut sushestvovat' v istochnikah gamma-vspleskov) energiya perenositsya cherez front elektronami, a ne protonami, za schet obrazovaniya par i komptonovskogo rasseyaniya.
Author: Arnon Dar Commets: Invited review at the meetings "Frontiere Objects in Astrophysics", May 2002, Vulcano, Italy and "Gamma Ray Bursts in the afterglow era'', September 2002, Rome, Italy Odna iz samyh populyarnyh al'ternativnyh modelei gamma-vspleskov v izlozhenii avtora. On (avtor) schitaet, chto ego model' luchshe ob'yasnyaet nablyudeniya.
Authors: F. Bournaud, F. Combes Commets: Accepted for publication in A&A. 20 pages, 14 figures. The resolution of several figures has been reduced in this version
Authors: Z. Ivezic et al. Commets: 6 pages, 4 color figures, contribution for the workshop "Variability with Wide-field Imagers", Lampedusa, September 16-20, 2002 Pohozhe, chto krome eksperimentov po nablyudeniyu gravitacionnogo mikrolinzirovaniya (MACHO, OGLE i dr.) naiden eshe odin obshirnyi istochnik informacii o peremennyh zvezdah. Eto Sloanovskii cifrovoi obzor neba (Sloan Digital Sky Survey). V nem soderzhitsya informaciya o 3,000,000 tochechnyh istochnikah na 700 kv.grad. nebesnoi sfery, nablyudavshiesya neskol'ko raz s intervalom ot 3 chasov do 3 let.
Authors: Volker Bromm, Abraham Loeb Commets: 11 pages, invited contribution to Proc. of 13th Annual October Astrophysics Conference in Maryland, "The Emergence of Cosmic Structure", College Park, October 2002, version with full resolution Figs. at http://cfa-www.harvard.edu/~vbromm/REVIEW/ Nebol'shoi obzor po obrazovaniyu pervyh zvezd i kvazarov vo Vselennoi. Nikakih pryamyh nablyudatel'nyh dannyh o samyh pervyh ob'ektah net, poetomu rassuzhdeniya ob otlichiyah nachal'noi funkcii mass zvezd "togda" i "teper'", a takzhe mnogie drugie voprosy nosyat teoreticheskii harakter. Odnako, mozhno skazat', chto v poslednee vremya issledovaniya v etoi oblasti prodvinulis' vpered. Poetomu obzor dovol'no aktualen.
Authors: R.R.Ransom et al. Commets: 22 pages, 4 figures S pomosh'yu VLBI tehniki udalos' postroit' izobrazhenie dvoinoi zvezdy tipa RS CVn: HR 5110 (=BH CVn; HD118216). Nablyudeniya velis' na chastote 8.4 Ggc.
Authors: A. Ringwald (DESY) Commets: 8 pages, 4 figures, ws-procs9x6.cls; talk presented at the Workshop on Strong and Electroweak Matter (SEWM 2002), October 2-5, 2002, Heidelberg, Germany Report-no: DESY 03-005 Obnaruzhenie takih neitrino - nedostizhimaya mechta celogo pokoleniya astrofizikov (i fizikov). Odin iz putei - Z-rezonans - vzaimodeistvie (annigilyaciya) neitrino sverhvysokih energii (~1022 eV) s sootvetstvuyushimi reliktovymi antichasticami. Sushestvovanie takogo processa mozhet byt' obnaruzheno po "linii poglosheniya" v spektre neitrino na samyh vysokih energiyah (vblizi GZK-zavala).
Authors: Claudia Maraston Commets: Invited review at the ESO workshop `Extra-galactic globular cluster systems", August 2002, eds. M. Kissler-Patig, 12 pages Ochen' chasto zvezdnye sistemy (galaktiki, skopleniya) izuchayut po ih integral'nym harakteristikam. V takoi situacii nezamenimym okazyvaetsya populyacionnyi sintez. Sut' metoda zaklyuchaetsya v modelirovanii populyacii zvezd. Parametry otdel'nyh ob'ektov detal'no ne rasschityvayutsya (oni i ne proyavlyayutsya v nablyudeniyah), zato udaetsya bolee-menee horosho opisat' parametry sistemy v celom. V korotkom obzore privoditsya istoriya razvitiya metoda, a takzhe rassmatrivayutsya nekotorye naibolee prostye modeli.
Authors: Yong-Zhong Qian Commets: 47 pages including 11 figures, invited review to appear in Progress in Particle and Nuclear Physics Odna iz samyh vazhnyh problem, rassmatrivaemyh v shkol'nom kurse astronomii - eto proishozhdenie elementov. Otnyud' ne dlya vseh yavlyaetsya ochevidnym tot fakt, chto fakticheski kazhdyi atom nashego tela (krome, mozhet byt', vodoroda) kogda-to pobyval v nedrah zvezdy. Raznye elementy obrazuyutsya v razlichnyh processah. V obzore rassmatrivaetsya t.n. r-process - process bystrogo (rapid) neitronnogo zahvata (est' eshe medlennyi - slow - s-process). Obzor dovol'no bol'shoi i podrobnyi. Privoditsya massa ssylok na original'nye i obzornye raboty. Sm. takzhe "Stellar Sources for Heavy r-Process Nuclei" astro-ph/0301461.
Authors: Andrew I. MacFadyen Commets: 7 pages, to appear in Proc. "From Twilight to Highlight - The Physics of Supernovae" ESO/MPA/MPE Workshop, Garching July 2002 V rabote rassmatrivaetsya svyaz' mezhdu vzryvami sverhnovyh, vrasheniem massivnyh zvezd (sm. takzhe vyshe) i gamma-vspleskami. V modeli kollapsara v nachale iz yadra massivnoi zvezdy obrazuetsya chernaya dyra, na kotoruyu idet moshnaya akkreciya iz ochen' plotnogo akkrecionnogo diska. Po mneniya avtora raboty nalichie takih diskov i razliyanyi uglovoi moment u raznyh zvezd-praroditelei mogut ob'yasnit' nekotorye pekulyarnye tipy sverhnovyh, a takzhe gamma-vspleski, nesoprovozhdayushiesya obychnoi sverhnovoi.
Authors: Weidong Li et al. Commets: 60 pages, 12 figures. A high resolution PostScript version is available at http://astro.berkeley.edu/~weidong/sn2002cx.ps "Dlya horoshego cheloveka nichego ne zhalko!" - 60 stranic o samoi neobychnoi sverhnovoi Ia. V stat'e privodyatsya detal'nye dannye nablyudenii. Vyvod avtorov ochen' interesnyi: "Ni odna iz sushestvuyushih teoreticheskih modelei ne mozhet odnovremenno ob'yasnit' vse osobennosti sverhnovoi SN 2002cx".
Authors: S. Esposito, G. Mangano, G. Miele, I. Picardi, and O. Pisanti Commets: 41 pages, 11 eps figures Bol'shoi obzor v duhe "neitrinnaya fizika dlya astronomov". Na pozdnih stadiyah evolyucii zvezd dlya teplovogo balansa ochen' vazhnymi okazyvayutsya neitrinnye poteri. V obzore avtory podrobno rassmatrivayut temp neitrinnyh poter' (t.e. ohlazhdeniya) pri usloviyah, sootvetstvuyushih nedram zvezd. Stat'ya slozhnaya (s astronomicheskoi tochki zreniya): mnogo formul i t.d. Dazhe ispol'zovanie rezul'tatov stat'i ne budet dlya astronoma legkim delom, no "komu seichas legko?"
Authors: H. Ritter, U. Kolb Commets: Submitted to A&A (4 pages). See the dedicated catalogue webpage at http://physics.open.ac.uk/RKcat/ (OU) or http://www.MPA-Garching.MPG.DE/RKcat/ (MPA) Opisyvaetsya sed'maya versiya kataloga tesnyh dvoinyh. V katalog vklyucheno pochti 700 sistem. V osnovnom eto kataklizmicheskie peremennye (pochti 500 shtuk). Kazhdye polgoda informaciya na saitah, gde razmeshen katalog, obnovlyaetsya.
Authors: Jean A. Eilek Commets: 12 pages, 6 figures, 3 in color. Invited review, to appear in Physics of Plasmas, May 2003. After publication it can be found at http://ojps.aip.org/pop V svyazi s rostom kolichestva nablyudatel'nyh dannyh po mezhgalakticheskoi srede v skopleniyah galaktik voznikaet nuzhda v poluteoreticheskih/polunablyudatel'nyh obzorah po fizike plazmy s uchetom astrofizicheskih osobennostei galakticheskih skoplenii. Obzor prostoi i ponyatnyi, v osnovnom privoditsya fenomenologiya (s nebol'shimi vkrapleniyami prostyh formul). Rassmatrivayutsya nereshennye problemy. Tak chto obzor budet interesnym dlya fizikov-plazmenshikov, kotorye do etogo "redko smotreli na nebo".
Authors: William H. Kinney Commets: Lectures given at the NATO Advanced Study Institute on Techniques and Concepts of High Energy Physics, St. Croix, USVI (2002). 60pp, 20 color figs. Version w/ high-res figs is available at http://www.astro.columbia.edu/~kinney/cv/papers/kinney_asi_2002.ps.gz Bol'shoi tekst lekcii. V spiske literatury, kak eto seichas prinyato (osobenno na shkolah), mnogo ssylok na setevye resursy i stat'i Arhiva elektronnyh preprintov. Tak chto tem, komu 60 stranic lekcii pokazhetsya nedostatochnym, budet legko naiti materialy, gde bolee podrobno rassmotrena ta ili inaya problema, upomyanutaya v obzore.
Authors: R.J.Massey, A.R.Refregier, C.J.Conselice & D.J.Bacon Commets: 13 pages, including 12 figures. Submitted to MNRAS. Version with higher resolution figures available from the shapelets web site at http://www.ast.cam.ac.uk/~rjm/shapelets/ Snachala byla sdelana parametricheskaya model' galaktiki, vosproizvodyashaya razlichnye vneshnie formy. Zatem bylo vyyasneno kak raspredeleny parametry etoi modeli. Teper' okazalos' vozmozhnym postroit' vyborku galaktik i vosproizvesti "deistvie" na nee teleskopa. V rabote vse eto bylo prodelano dlya togo, chtoby smodelirovat' glubokie obzory HST. No mne kazhetsya, chto etot algoritm mozhet naiti i drugie - chisto illyustrativnye - primeneniya.
Authors: M.A. Garrett et al. Commets: 6 pages, 2 figures. To appear in the proceedings of the conference "Radio Galaxies: Past, present and future", Leiden, 11-15 Nov 2002, eds. M. Jarvis et al.Paper with improved figures at http://www.jive.nl/~mag/leiden.ps.gz VLBI - Very Large Baseline Interferometry. Radionablyudeniya so sverhdlinnoi bazoi. Obychno VLBI obzorami ne zanimaetsya - nablyudayutsya izbrannye istochniki (chashe vsego - aktivnye galaktiki) v raznyh chastyah neba. Svyazano eto s malym polem zreniya (sotni millisekund dugi). V stat'e opisyvaetsya pervaya ser'eznaya popytka preodolet' eti trudnosti za schet primeneniya tehnologii nablyudenii s korotkoi bazoi, no s sohraneniem vseh dostoinstv VLBI.
Authors: Matthias Stute, Max Camenzind Commets: Comments: 11 pages, 18 figures, accepted for publication in MNRAS Journal-ref: MNRAS 336, 831 (2002) Nalichie poverhnosti i bystroe vrashenie neitronnyh zvezd delaet neprimenimymi dlya rascheta akkrecii na nih resheniya, poluchennye dlya chernyh dyr. V 2000 g. Manko i dr. udalos' poluchit' reshenie uravnenii Einshteina, horosho opisyvayushee pole vne neitronnoi zvezdy. Odnako, massa, uglovoi moment i kvadrupol'nyi moment, vhodyashie v uravnenie, dlya real'nyh neitronnyh zvezd svyazany drug s drugom (kvadrupol'nyi moment opredelyaetsya massoi i vrasheniem). Eto tozhe nuzhno kak-to uchityvat'. Dlya etogo provodilis' chislennye vychisleniya (Kuk i dr. 1994). Shtute i Kamenzind v svoei stat'e pytayutsya ob'edinit' dva podhoda (Manko i dr. i Kuka i dr.) dlya polucheniya samosoglasovannoi relyativistskoi modeli gravitacionnogo polya vne neitronnoi zvezdy (pohozhii podhod, no bez primeneniya novogo resheniya Manko i dr. primenyalsya v rabotah Sibgatullina i Syunyaeva).
Authors: W. Forman et al. Commets: Contribution to IAU Symposium 214 "High Energy Processes and Phenomena in Astrophysics" (6-10 August, 2002; Suzhou, China) Opisyvayutsya rezul'taty nedavnih nablyudenii goryachego vnegalakticheskogo gaza na rentgenovskih sputnikah Chandra i HMM. Novye tehnologii pozvolili uvidet' yavleniya, kotorye do etogo ne nablyudalis'. Dayutsya popytki ih teoreticheskogo opisaniya.
My budem starat'sya hotya by perechislit' interesnye (dlya shirokoi publiki)
stat'i, poyavivshiesya v razdele
physics
(vklyuchaya cross-listing).
Authors: Andre Gsponer Commets: Postface to a book to be published by the Bertrand Russel Foundation, 30 pages
Obsuzhdayutsya problemy primenenie urana v voennoi metallurgii i svyazannye s
etim voprosy.
Authors: Katherine Brading, Elena Castellani Commets: 16 pages. To appear in K. Brading and E. Castellani (eds.), "Symmetries in Physics: Philosophical Reflections", Cambridge University Press, 2003 Vvodnaya stat'ya k tomu trudov, posvyashennomu filosofskim razmyshleniyam o simmetrii v fizike. Vvedenie ono i est' vvedenie. Bylo by interesno samu knigu pochitat'. No za neimeniem bol'shego ....
Arhiv statei, voshedshih v predydushie vypuski.
Razdely arhiva (s iyulya 2002 g.): Poleznye astronomicheskie ssylki. Obzornye stat'i v astro-ph s 2001 g. |
|
|
|
|
Publikacii s klyuchevymi slovami:
elektronnye preprinty - obzory - astro-ph
Publikacii so slovami: elektronnye preprinty - obzory - astro-ph | |
Sm. takzhe:
Vse publikacii na tu zhe temu >> | |
