Four New SX Phoenicis Variable Stars

A. V. Khruslov
Russia, Tula

Received:   9.02.2008;   accepted:   11.02.2008
(E-mail for contact: khruslov@bk.ru)

Comments:


1. M-m = 0.35, B-V = -0.253 (Tycho2) is possibly erroneous, the star is too faint for this catalog. J-H = 0.136 (2MASS).

2. M-m = 0.3:, J-H = 0.168 (2MASS). The ROTSE data with photometric correction flags (usually rejected) were kept for the analysis.

3. M-m = 0.25, J-H = 0.065 (2MASS). The ROTSE data with photometric correction flags (usually rejected) were kept for the analysis.

4. M-m = 0.3, J-H = 0.120 (2MASS).

Remarks:
I present the discovery of 4 new High-Amplitude Delta Scuti stars (HADS). Their large distances from the galactic plane make it possible to consider them SX Phoenicis variables. My search for variables was carried out in the publicly available data of the Northern Sky Variability Survey (NSVS, Wozniak et al., 2004, also see http://skydot.lanl.gov/nsvs). These observations were analyzed using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The coordinates are from the 2MASS catalog.

References:
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W. et al., 2004, Astron. J., 127, 2436