Peremennye Zvezdy

Article in PDF
"Peremennye Zvezdy",
Prilozhenie
,
vol. 9, N 26 (2009)

Four High-Amplitude Double-Mode Delta Scuti Variables

A. V. Khruslov
Russia, Tula

ISSN 2221–0474

Received:   8.04.2009;   accepted:   20.10.2009
(E-mail for contact: khruslov@bk.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 ASAS 035407+0759.2, TYC 0658 00556 103 54 07.27, +07 59 15.4DSCT(B)11.011.4V(see Comments)(see Comments)max Comm. 11.PNG ASAS 035407+0759.2 NSVS 9387852 NSVS 12150953
2 ASAS 110953-6058.0, GSC 8959-0040911 09 52.24, -60 57 56.7DSCT(B)11.812.4V(see Comments)(see Comments)max Comm. 22.PNG ASAS 110953-6058.0
3 ASAS 135715-5255.4, HD 121517, TYC 8664 00911 113 57 15.60, -52 55 22.6DSCT(B)9.169.63V(see Comments)(see Comments)max Comm. 33.PNG ASAS 135715-5255.4
4 ASAS 162022-3541.2, HD 146953, TYC 7355 00453 116 20 21.77, -35 41 16.0DSCT(B)9.419.68V(see Comments)(see Comments)max Comm. 44.PNG ASAS 162022-3541.2

Comments:


1. 
    TYC 0658 00556 1 = ASAS 035407+0759.2 =
NSVS 9387852 = NSVS 12150953
B-V = 0.355 (Tycho2), J-H = 0.144 (2MASS), P1/P0 = 0.7682

P = 0.13979 d (Pojmanski 2002)
ModeFrequency, c/d Semi-amplitude, V mag Period, day Epoch, HJD
f0 7.15352 0.074 0.1397914 2453724.066
f1 9.31170 0.081 0.1073918 2453724.108


2. 
    GSC 8959-00409 = ASAS 110953-6058.0
J-H = 0.156 (2MASS), P1/P0 = 0.7748

P = 0.110801 d (Pojmanski 2002)
ModeFrequency, c/d Semi-amplitude, V mag Period, day Epoch, HJD
f0 9.02516 0.160 0.1108014 2453681.038
f1 11.64806 0.06 0.0858512 2453681.103
f1 + f0 20.67337 0.03 0.0483714 2453681.022


3. 
    TYC 8664 00911 1 = ASAS 135715-5255.4 = HD 121517
B-V = 0.460 (Tycho2), J-H = 0.170 (2MASS), P1/P0 = 0.7712

P = 0.11103 d (Pojmanski 2002)
ModeFrequency, c/d Semi-amplitude, V mag Period, day Epoch, HJD
f0 8.49018 0.065 0.1177831 2453490.086
f1 11.00931 0.112 0.0908322 2453490.091
f1 + f0 19.49949 0.026 0.0512834 2453490.036
f1 - f0 2.51913 0.020 0.396962 2453490.123
2f1 - f0 13.52843 0.007 0.0739184 2453490.024
2f0 16.98035 0.01 0.0588916 2453490.024
3f0 25.47057 0.01 0.0392610 2453490.005


4. 
    TYC 7355 00453 1 = ASAS 162022-3541.2 = HD 146953
B-V = 0.657 (Tycho2), J-H = 0.227 (2MASS), P2/P1 = 0.7978

P = 0.1843 d (Pojmanski 2002)
ModeFrequency, c/d Semi-amplitude, V mag Period, day Epoch, HJD
f1 5.42593 0.072 0.1843001 2453095.082
f2 6.80065 0.039 0.1470447 2453095.159
f2 + f1 12.22664 0.008 0.0817886 2453095.040
2f2 13.60113 0.016 0.0735224 2453095.050

Remarks:
I present an investigation of four known DSCT variables. The variability of these stars was reported by Pojmanski (2002).

I re-analysed ASAS-3 and NSVS data using the period-search software developed by Dr. V.P. Goranskij for Windows environment. According to ASAS-3 (Pojmanski 2002) and ROTSE-I/NSVS (Wozniak et al. 2004) data, the variables are high-amplitude double-mode Delta Scuti stars.

The period ratios P1/P0 and P2/P1 are typical for radially pulsating high-amplitude double-mode Delta Scuti stars (Petersen & Christensen-Dalsgaard 1996). In certain cases, multiple frequencies or frequencies connected with interactions between the two main modes were found (see the Comments).

References:
Petersen, J.O., Christensen-Dalsgaard, J., 1996, Astron. and Astrophys., 312, 463
Pojmanski, G., 2002, Acta Astronomica, 52, 397
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W., et al., 2004, Astron. J., 127, 2436



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