"Peremennye Zvezdy", Prilozhenie,
vol. 12, N 7 (2012)
GSC 6558-01290, a New Double-Mode RR Lyrae Variable Star
A. V. Khruslov Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia
Received: 24.05.2012; accepted: 31.07.2012
(E-mail for contact: firstname.lastname@example.org)
GSC 6558-01290, ASAS 075842-2536.1
07 58 42.16, -25 36 00.9
11.8 – 12.3 (V);
(see Remarks) d;
JD (see Remarks)
The variability of GSC 6558-01290 = ASAS 075842-2536.1 was discovered by Pojmanski
The ASAS-3 catalog lists the variable as an RRC star with the period of 0.41013 d.
I reinvestigated the star using the currently available ASAS-3 data and found it
an RR(B) star,
pulsating in the first and second overtone modes (an extension of the GCVS RR(B)
which is defined as fundamental-mode and first-overtone pulsators).
The phased light curves plotted for the tabulated elements are shown in the Figure.
Semi-amplitude, V mag
The period ratio P2/P1 = 0.8000 is typical of double-mode variables
in the first and second overtone modes.
The tabulated coordinates of the variable were drawn from the
Tycho2 catalog. J–H = 0.231 (2MASS). The star is in a close pair
with the much fainter GSC 6558-00870; the combined brightness was measured, thus
the actual amplitude can be somewhat larger.