Peremennye Zvezdy (Variable Stars) 43, No. 8, 2023 Received 23 October; accepted 30 October. |
Article in PDF |
DOI: 10.24412/2221-0474-43-86-100
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In 2005-2014, we obtained 16568 photometric measurements in the photometric system for 64 type II Cepheids and 54 RV Tau stars using the 76-cm telescope of the South African Astronomical Observatory (SAAO, South Africa) and the 40-cm telescope of the Cerro Armazones Observatory of the Universidad Catolica del Norte (OCA, Chile). The tables of observations and the plots of light curves are presented. |
From April 2005 through May 2014, we used the 76-cm telescope of South African Astronomical Observatory (SAAO, Republic of South Africa) for photoelectric and CCD observations, while the 40-cm telescope of Cerro Armazones Observatory (OCA) of the Universidad Catolica del Norte in Chile was used for CCD observations only. The , , and filters of the Kron-Cousins system (Cousins, 1976) were used. The observation and reduction techniques were described by Berdnikov et al. (2004, 2011), respectively for photoelectric and CCD observations.
We acquired a total of 10384 photometric measurements for 64 type II Cepheids and 6184 photometric measurements for 54 RV Tau-type variables. All light curves, constructed with the elements from Tables 1-2, are presented in Figures 1-12. Three-color observations are given in text files (Tables 3 - 4) in the html version of the paper.
The scatter of data points in the plots indicates that observational errors are close to 0.01. Observations of three Cepheids - ASAS 115302-2313.0, ASAS 174134-4854.6, and ASAS 185152-1333.6 - do not fit into a single light curve because of abrupt changes of their periods; in Fig. 7, we repeat these light curves taking into account the shifts of seasonal light curves for these Cepheids.
The light curves of most of the RV Tau type stars are highly unstable, resulting in times of minima deviating from the ephemerides reported in the GCVS and ASAS-3 variable-star catalogs (Table 2).
The new data obtained in this study will be used to study the structure and kinematics of the old disk and Galactic halo and also to study the properties of Cepheids and RV Tau type stars and, particular, to search for evolutionary changes in their periods.
References:
Berdnikov, L.N., Kniazev, A.Yu., Sefako, R. et al., 2011, Astron. Rep., 55, 816
Berdnikov, L.N., Turner, D.G., 2004, Astron. Astrophys. Trans., 23, 253
Cousins, A.W.J., 1976, Mem. Roy. Astron. Soc., 81, 25
Fig. 1. Light curves of type II Cepheids: V475 Ara, GK Cen, IU Cen, V415 Cen, V445 Cen, BV Cha, XY Hyi, DF Hyi, VX Ind, and UX Lup. The circles and dots show photoelectric and CCD observations, respectively. |
Fig. 2. The same as in Fig. 1 but for II Nor, CE Oph, V2137 Oph, V2628 Oph, GK Sgr, V1821 Sgr, V1822 Sgr, V1828 Sgr, V1882 Sgr, V2284 Sgr, V2511 Sgr, and V2546 Sgr. |
Fig. 3. The same as in Fig. 1 but for V2793 Sgr, V2944 Sgr, V3820 Sgr, V507 Sco, V516 Sco, V517 Sco, V532 Sco, V533 Sco, and V542 Sco. |
Fig. 4. The same as in Fig. 1 but for V706 Sco, V708 Sco, V742 Sco, DD Vel, YZ Vir, ASAS 003041-4416.4, ASAS 044546-1748.7, ASAS 050514+2145.8, ASAS 070747-2455.2, ASAS 072845-4428.3, and ASAS 092701+1412.1. |
Fig. 5. The same as in Fig. 1 but for ASAS 094844-3921.4, ASAS 104440-6003.6, ASAS 115302-2313.0, ASAS 133028-3812.5, ASAS 140434-4532.4, ASAS 142357-0100.1, ASAS 144155-1938.1, ASAS 160723-2957.2, ASAS 161115-1651.6, ASAS 164328-2122.6, ASAS 165857-4312.3, and ASAS 171022-0403.6. |
Fig. 6. The same as in Fig. 1 but for ASAS 173443-1741.8, ASAS 174134-4854.6, ASAS 185152-1333.6, ASAS 190418-3142.2, ASAS 190649+2300.6, ASAS 190744-5950.7, ASAS 193606-2538.3, ASAS 193907-2049.2, ASAS 211406+0019.2, and ASAS 231839-6752.5. |
Fig. 7. The same as in Fig. 1 but for ASAS 115302-2313.0, ASAS 174134-4854.6, and ASAS 185152-1333.6 with seasonal light-curve shifts taken into account. |
Fig. 8. Light curves of RV Tau-type stars: DY Aql, EZ Aql, V590 Aql, RT Ara, UY Ara, V686 Ara, KO Cnc, RX Cap, GK Car, RU Cen, SX Cen, and CN Cen. |
Fig. 9. The same as in Fig. 8 but for GP Cha, SY Cir, V385 CrA, V338 Lib, AS Mus, EP Mus, PX Mus, V338 Mus, V404 Nor, and TT Oph. |
Fig. 10. The same as in Fig. 8 but for TX Oph, UZ Oph, V453 Oph, AR Pup, V594 Pup, V558 Sgr, V760 Sgr, V1864 Sgr, V411 Sco, V423 Sco, and AN Sct. |
Fig. 11. The same as in Fig. 8 but for HI Tel, NW Tel, CY Vel, V517 Vel, ASAS 093507-4534.8, ASAS 121159-5847.0, ASAS 135914-5210.7, ASAS 154200-2046.7, ASAS 170042-3300.4, ASAS 170320-2428.9, and ASAS 171139-2328.0. |
Fig. 12. The same as in Fig. 8 but for ASAS 171413-1320.7, ASAS 172055-2129.3, ASAS 174955-4019.9, ASAS 175310-1519.6, ASAS 175846+2428.4, ASAS 175934-3935.1, ASAS 181811-3533.7, ASAS 193648-3425.8, ASAS 194411-1119.5, and ASAS 202412-2457.0. |
Table 1. Ephemerides for CW-type Cepheids
Cepheid | Epoch, | Period | Cepheid | Epoch, | Period |
JD hel 24... | days | JD hel 24... | days | ||
V475 Ara | 36721.6336 | 1.50120000 | V708Sco | 55182.329 | 27.1700 |
GK Cen | 55412.1963 | 1.949833 | V742Sco | 55005.93 | 14.51770 |
IU Cen | 53336.0704 | 3.3192516 | DDVel | 55045.72 | 13.2075 |
V415 Cen | 54236.79 | 26.6603 | YZVir | 54790.187 | 14.47271 |
V445 Cen | 55470.70 | 14.2172 | ASAS 003041-4416.4 | 54205.2546 | 1.90068 |
BV Cha | 54161.9961 | 1.23803885 | ASAS 044546-1748.7 | 55164.4719 | 0.9195727 |
XY Hyi | 55907.484 | 22.1587 | ASAS 050514+2145.8 | 53824.124 | 13.9410 |
DF Hyi | 54267.0129 | 1.1225989 | ASAS 070747-2455.2 | 54154.920 | 11.18265 |
VX Ind | 53590.2859 | 1.4619446 | ASAS 072845-4428.3 | 54526.8885 | 1.4377536 |
UX Lup | 54740.410 | 16.25356 | ASAS 092701+1412.1 | 55566.9273 | 1.3212185 |
II Nor | 50207.66 | 23.5333 | ASAS 094844-3921.4 | 54667.2918 | 1.2017308 |
CE Oph | 54407.253 | 15.88766 | ASAS 104440-6003.6 | 54349.02 | 105.833 |
V2137 Oph | 56777.5075 | 1.18202240 | ASAS 115302-2313.0 | 53855.360 | 15.5727 |
V2628 Oph | 54487.34 | 13.3088 | ASAS 133028-3812.5 | 53593.49 | 15.2940 |
GK Sgr | 55555.692 | 14.86662 | ASAS 140434-4532.4 | 55623.797 | 16.99892 |
V1821 Sgr | 56784.6324 | 9.51627060 | ASAS 142357-0100.1 | 55579.8951 | 1.3067458 |
V1822 Sgr | 54863.00 | 7.52557 | ASAS 144155-1938.1 | 55259.9049 | 1.0118964 |
V1828 Sgr | 56783.50 | 12.99325 | ASAS 160723-2957.2 | 55424.186 | 37.3283 |
V1882 Sgr | 54908.3355 | 2.71119248 | ASAS 161115-1651.6 | 54941.23 | 13.2261 |
V2284 Sgr | 54688.573 | 1.938658 | ASAS 164328-2122.6 | 53655.88 | 37.439 |
V2511 Sgr | 56767.0966 | 1.72475700 | ASAS 165857-4312.3 | 55085.865 | 10.99158 |
V2546 Sgr | 54580.82 | 14.3905 | ASAS 171022-0403.6 | 54780.795 | 15.1863 |
V2793 Sgr | 54641.989 | 16.22011 | ASAS 173443-1741.8 | 54974.20 | 18.1107 |
V2944 Sgr | 54649.727 | 12.22564 | ASAS 174134-4854.6 | 55456.358 | 10.54989 |
V3820 Sgr | 50804.12 | 13.13825 | ASAS 185152-1333.6 | 55500.7640 | 1.268903 |
V507 Sco | 55021.85 | 11.79856 | ASAS 190418-3142.2 | 54136.70 | 39.328 |
V516 Sco | 55296.726 | 15.65785 | ASAS 190649+2300.6 | 54738.974 | 4.839092 |
V517 Sco | 55209.189 | 1.176306 | ASAS 190744-5950.7 | 54812.2021 | 1.790798 |
V532 Sco | 55131.2527 | 24.1493 | ASAS 193606-2538.3 | 55434.182 | 9.51917 |
V533 Sco | 56745.8888 | 15.52900 | ASAS 193907-2049.2 | 55442.829 | 14.2869 |
V542 Sco | 54546.653 | 15.23567 | ASAS 211406+0019.2 | 55168.146 | 15.2634 |
V706 Sco | 55253.224 | 12.63584 | ASAS 231839-6752.5 | 55362.3226 | 2.5515796 |
Table 2. Ephemerides
for RV Tau stars
Star | Epoch, | Period | Star | Epoch, | Period |
JD hel 24... | days | JD hel 24... | days | ||
DYAql | 55149.47 | 131.86 | V558Sgr | 2455102.80 | 63.36 |
EZAql | 55148.87 | 38.69 | V760Sgr | 2455164.45 | 45.16 |
V590 Aql | 55186.41 | 117.38 | V1864 Sgr | 2455130.53 | 80.80 |
RTAra | 55117.38 | 76.43 | V411Sco | 2455142.85 | 133.06 |
UYAra | 55107.99 | 56.91 | V423Sco | 2455115.17 | 59.60 |
V686 Ara | 55111.62 | 36.21 | ANSct | 2455217.62 | 65.41 |
KOCnc | 55129.78 | 66.23 | HITel | 2455207.04 | 66.28 |
RXCap | 55163.93 | 67.83 | NWTel | 2455218.33 | 68.99 |
GKCar | 55197.39 | 55.30 | CYVel | 2455193.97 | 39.07 |
RUCen | 55112.28 | 64.66 | V517Vel | 2455088.95 | 161.15 |
SXCen | 55165.19 | 32.96 | ASAS093507-4534.8 | 2455352.13 | 122.36 |
CNCen | 55145.43 | 50.60 | ASAS121159-5847.0 | 2455427.81 | 198.60 |
GPCha | 55181.69 | 100.07 | ASAS135914-5210.7 | 2455049.04 | 75.81 |
SYCir | 55094.23 | 46.25 | ASAS154200-2046.7 | 2455119.34 | 49.87 |
V385 CrA | 55137.00 | 78.97 | ASAS170042-3300.4 | 2455108.36 | 46.23 |
V338 Lib | 55100.66 | 311.61 | ASAS170320-2428.9 | 2454868.31 | 90.02 |
ASMus | 55125.04 | 52.92 | ASAS171139-2328.0 | 2454850.62 | 53.07 |
EPMus | 55075.43 | 42.65 | ASAS171413-1320.7 | 2455060.13 | 56.02 |
PXMus | 55028.92 | 58.91 | ASAS172055-2129.3 | 2455186.22 | 68.78 |
V338 Mus | 54929.83 | 206.41 | ASAS174955-4019.9 | 2455150.58 | 60.85 |
V404 Nor | 55100.52 | 53.64 | ASAS175310-1519.6 | 2455180.44 | 58.98 |
TTOph | 55089.32 | 60.95 | ASAS175846+2428.4 | 2454803.51 | 94.74 |
TXOph | 54980.78 | 133.59 | ASAS175934-3935.1 | 2455194.35 | 61.80 |
UZOph | 55090.23 | 87.40 | ASAS181811-3533.7 | 2455117.27 | 70.97 |
V453 Oph | 55070.00 | 81.02 | ASAS193648-3425.8 | 2455097.67 | 106.37 |
ARPup | 55254.36 | 76.72 | ASAS194411-1119.5 | 2455149.13 | 58.65 |
V594 Pup | 55132.62 | 57.93 | ASAS202412-2457.0 | 2455179.57 | 51.35 |