| Article in PDF |
"Peremennye Zvezdy", Prilozhenie, vol. 10, N 4 (2010) |
| ISSN 2221–0474 |
Received: 4.02.2010; accepted: 12.02.2010
(E-mail for contact: agerer.zweik@t-online.de)
|
Comments:
1. In the field of BY Per, discovered in 2005. Comparison star: a = GSC 3688-00810. Check star: b = GSC 3688-00574. Fourteen minima could be observed between 2005 and 2009. Least squares ephemeris: E = 2453654.5903 +/- 0.0005, P = 0.3593411 +/- 0.0000002. MinII = 13.54.
2. In the field of BY Per, discovered in 2006. Comparison star: a = GSC 3688-01952. Check star: b = GSC 3688-00810. Eight minima could be observed between 2005 and 2009. Least squares ephemeris: E = 2453651.513 +/- 0.002, P = 0.623394 +/- 0.000001. MinII = 14.50.
3. In the field of BN Tau, discovered in 2006. Comparison star: a = GSC 2371-01912. Check star: b = GSC 2371-01091. Three minima could be observed in 2006. MinII = 14.86.
4. In the field of HP Aur, discovered in 2005. Comparison star: a = USNO-B1.0 1257-0092299. Check star: b = GSC 02401-01128. Seven minima could be observed between 2005 and 2007. Least squares ephemeris: E = 2453386.3956 +/- 0.0003, P = 0.5211060 +/- 0.0000007.
5. In the field of UV Hya, discovered in 2002. Comparison star: a = GSC 0238-01955. Check star: b = GSC 0238-00985. Nineteen minima could be observed between 2002 and 2008. Least squares ephemeris: E = 2454506.3981 +/- 0.0004, P = 0.3216619 +/- 0.0000001. MinII = 13.87. Two minima observed by the author and published in IBVS 5657 led to an entry in the VSX.
6. In the field of UU Boo, discovered in 2003. Comparison star: a = GSC 2569-01442. Check star: b = GSC 2569-00527. Twenty-two minima could be observed between 2003 and 2005. Least squares ephemeris: E = 2452726.4367 +/- 0.0003, P = 0.2955713 +/- 0.0000003. MinII = 13.50.
7. In the field of V1004 Cyg, discovered in 2005. Comparison star: a = GSC 2673-02423. Check star: b = GSC 2673-00102. Five minima could be observed between 2003 and 2005. MinII = 13.40.
8. In the field of CD Del, discovered in 2006. Comparison star: a = GSC 1086-01465. Check star: b = GSC 1086-02079. Six minima could be observed between 2006 and 2008. Least squares ephemeris: E = 2454001.384 +/- 0.002, P = 0.553630 +/- 0.00005. MinII = 12.8.
9. In the field of V351 Cyg, discovered in 2003. Comparison star: a = GSC 3575-06158. Check star: b = GSC 3575-06602. Two minima could be observed in 2003 and one in 2009. MinII = 12.53.
10. In the field of CC Peg, discovered in 2004. Comparison star: a = GSC 2201-00707. Check star: b = GSC 2201-00061. Twelve minima could be observed between 1999 and 2006. Least squares ephemeris: E = 2453251.4755 +/- 0.0004, P = 2.954177 +/- 0.000001. MinII = 14.75.
11. In the field of V1401 Cyg, discovered in 2004. Comparison star: a = GSC 3612-00440. Check star: b = GSC 3612-00050. Five minima could be observed between 2004 and 2009. MinII = 12.74.
12. In the field of IZ Lac and V342 Lac, discovered in 2002. Comparison star: a = GSC 3618-01328. Check star: b = GSC 3618-01160. Fifteen minima could be observed between 2002 and 2009. Least squares ephemeris: E = 2454712.574 +/- 0.001, P = 0.5792332 +/- 0.0000005. MinII = 13.45. The lightcurve seems to be distorted by a spot - O'Connell effect.
13. In the field of IZ Lac, discovered in 2002. Comparison star: a = GSC 3618-00514. Check star: b = GSC 3618-00358. Ten minima could be observed between 2002 and 2009. Least squares ephemeris: E = 2455062.392 +/- 0.001, P = 0.2407040 +/- 0.0000001. MinII = 12.50.
14. In the field of ER Lac, discovered in 2004. Comparison star: a = GSC 3619-01839. Check star: b = GSC 3619-00445. Nine minima could be observed between 2004 and 2009. Least squares ephemeris: E = 2453256.591 +/- 0.002, P = 0.4848981 +/- 0.0000007. MinII = 11.34.
15. In the field of CH Lac, discovered in 2006. Comparison star: a = GSC 3629-02231. Check star: b = GSC 3629-01635. Three minima could be observed between 2006 and 2008. MinII = 13.93:.
16. In the field of EL Cas, discovered in 2006. Comparison star: a = GSC 4285-00860. Check star: b = GSC 4285-00928. Nine minima could be observed between 2006 and 2009. Least squares ephemeris: E = 2453768.3846 +/- 0.0006, P = 0.3746284 +/- 0.0000003. MinII = 13.33.
17. In the field of EP Cas, discovered in 2004. Comparison star: a = GSC 4009-01412. Check star: b = GSC 4009-00901. Five minima could be observed between 2004 and 2009. Least squares ephemeris: E = 2453656.4107 +/- 0.0008, P = 0.5599145 +/- 0.0000004. MinII = 12.59.Remarks:
In the course of my investigation of known variable stars on a regular basis, nearby stars are sometimes detected as variables. The observations were carried out with two semiautomatic telescopes, 8-inch and 14-inch Schmidt-Cassegrain ones, operated at my private observatory. Before 2008, both telescopes were equipped with cooled SBIG ST6 CCD-cameras. Beginning with 2008, these cameras are replaced with SIGMA 1603 cameras, containing a cooled Kodak KAF1603ME chip. Normally, the exposures are 60s through a minus-Ir filter; in some cases B, V, or R filters are used.
Differential magnitudes are calculated using a comparison star ("a" in the charts) with a B-R color index resembling that of the variable. The constancy of the comparison is controlled using several check stars in the field, one of them is labeled "b" in the charts. Rough instrumental magnitudes are calculated simply by adding the R-magnitude of the comparison star taken from the USNO-B1.0 catalogue to the differential magnitudes. The coordinates are also taken from the USNO-B1.0 catalogue. Concentric aperture photometry is carried out by means of a self-written program, after bias, dark- and flatfield correction of the exposures.
The elements for each of the new variables are calculated using a linear least squares fit to all available extrema found in my collected CCD frames of the corresponding sky position. These timings of minima are to be published in one of the next compilations of BAV results.
Acknowledgements: I would like to thank S.V. Antipin and N.N. Samus for helpful discussion.
This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France and of the The International Variable Star Index (VSX) operated by the American Association of Variable Star Observers (AAVSO).
