Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 11, N 24 (2011)

V337 Ori, a High-Amplitude Delta Scuti Variable Star with Radial and Nonradial Pulsation

A. V. Khruslov
Russia, Tula

Received:   7.04.2011;   accepted:   28.06.2011
(E-mail for contact: khruslov@bk.ru)


Star Name: V337 Ori, GSC 1320-00167, ASAS 055921+2002.1, 1SWASP J055920.57+200207.5
Coordinates (J2000): 05 59 20.58, +20 02 07.5
Variability type: DSCT;   Limits, System: 10.85 – 11.45 (V);    
Period: (see Remarks) d;   Epoch(max): JD (see Remarks)

Remarks:
Samus and Antipin (2006) communicated that V337 Ori = GSC 1320-00167, earlier believed to be a short-period, probably, eclipsing, variable (Hoffmeister 1949), irregular variable (Ahnert 1950), late-type star (M5, Neckel 1958) was actually a white star, the earlier announced spectral type actually corresponding to a neighbor. They analyzed ASAS-3 and ROTSE1/NSVS data and found the variable to be a high-amplitude Delta Scuti (HADS) variable with the light elements: JD(max) = 2453068.586 + 0.201261 d x E. The GCVS currently gives the type DSCT and the light elements JD(max) = 2453068.587 + 0.2012592 d x E, derived by GCVS compilers.

I analyzed all available observations of V337 Ori from the ASAS-3 (Pojmanski 2002) and SuperWASP (Butters et al. 2010) online public archives. By now, the ASAS-3 data have been considerably appended with new observations, and their analysis permitted me to detect a nonradial pulsation co-existing with the principal mode, a finding then completely confirmed with the analysis of SuperWASP data. When reducing the SuperWASP observations, I rejected nights with large scatter of data points, probably due to instrumental errors. The WASP data from different time intervals exhibit considerable differences of the mean brightness, so that we had to consider two time intervals separately. The figure presents the results of our analysis for the JD2454022–2454155 time range. The JD2453245–2453278 time interval was rejected because of its being short, with too few observations. The observations were analyzed using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The SuperWASP observations are available as FITS tables which were converted into ASCII tables using the OMC2ASCII program as described by Sokolovsky (2007).

V337 Ori = ASAS 055921+2002.1 = 1SWASP J055920.57+200207.5
ModeFrequency, c/d Semi-amplitude, mag Period, days Epoch, JD
f1 4.968680 0.229 (V); 0.220 (WASPmag) 0.2012607 2454098.634
f2 6.724059 0.024 (V); 0.030 (WASPmag) 0.1487197 2454098.637
f2 + f1 11.693 0.013 (WASPmag) 0.085523 2454098.632
f2 – f1 1.75509 0.011 (WASPmag) 0.56977 2454098.605


P2/P1 = 0.7389. The nonradial frequencies 7.6173 c/d (P = 0.13128 d), 6.6908 c/d (P = 0.14946 d) and 17.663 c/d (P = 0.056615 d) are also not excluded.

Acknowledgements: Thanks are due to Dr. K.V. Sokolovsky for his advice concerning data retrieving.

References:
Ahnert, P., 1950, Mitteilungen Ver. Sterne, Nr. 118
Butters, O.W., West, R.G., Anderson, D.R., et al., 2010, Astron. and Astrophys., 520, L10
Hoffmeister, C., 1949, Ergänz. Astron. Nachr., 12, Nr. 1
Neckel, H., 1958, Astrophys. J., 128, 510
Pojmanski, G., 2002, Acta Astronomica, 52, 397
Samus, N.N., Antipin, S.V., 2006, IBVS, No. 5699 (Star No. 4)
Sokolovsky, K.V., 2007, PZP, 7, 30

Light Curve
V337 Ori, a High-Amplitude Delta Scuti Variable Star with Radial and Nonradial Pulsation


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