1999MNRAS.303..275Z


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST02:05:33

1999MNRAS.303..275Z - Mon. Not. R. Astron. Soc., 303, 275-283 (1999/February-3)

The gamma Dor variable HR 8799: results from a multisite campaign.

ZERBI F.M., RODRIGUEZ E., GARRIDO R., MARTIN S., ARELLANO FERRO A., SAREYAN J.-P., KRISCIUNAS K., AKAN M.C., EVREN S., IBANOGLU C., KESKIN V., PEKUENLUE R., TUNCA Z., LUEDEKE K., PAPARO M., NUSPL J. and GUERRERO G.

Abstract (from CDS):

In this paper, we present the results of a multisite photometric campaign devoted to the γ Doradus type variable HR 8799. From Johnson and Strömgren data, we were able to identify three independent frequencies (f1= 1.9791 cycle.d–1, f2=1.7268 cycle.d–1 and f3=1.6498 cycle.d–1) as well as another signal, which we are able to identify as the coupling term between two of the frequencies (f4=f1-f2=0.2479 cycle.d–1). These four frequencies are able to account for all of the observed variations down to the 1σ significance level. We discuss another possible interpretation of these frequencies using a model of quasi-stochastic amplitude modulation. In this scenario, we are able to show that HR 8799 might be pulsating with two independent frequencies, one of which undergoes amplitude modulation similar to other γ Dor objects. In addition, we discuss a preliminary mode identification based on the observed colour curves. Finally, 18 simultaneous, high-resolution echelle spectra were collected on two nights and we qualitatively compare the radial velocities from these data with our photometry.

Abstract Copyright: 1999 RAS

Journal keyword(s): stars: individual: HR 8799 - stars: pulsation - stars: variables: other

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* BU Psc gD* 00 02 02.6172809226 -02 45 58.217053877   7.20 6.92     A9V/IV 48 0
2 * gam Dor gD* 04 16 01.5882311191 -51 29 11.919063290   4.55 4.20     F1V 281 0
3 * 9 Aur gD* 05 06 40.6313508866 +51 35 51.804886029       4.8   F2V 174 0
4 V* DD CVn gD* 12 24 56.9361558206 +42 51 17.109539057   7.51 7.14     F2V 58 0
5 V* V2118 Oph gD* 18 01 33.2034743748 +11 17 08.736474287   7.37 7.01     F2IV-V 59 0
6 * 51 Peg ** 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1058 1
7 HD 217715 * 23 02 21.0537512702 +23 20 25.721255973   6.87 6.84     A0 14 0
8 HD 218261 PM* 23 06 31.8856750675 +19 54 39.067828074   6.79   6.1   F6V 84 0
9 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 854 1
10 V* BT Psc gD* 23 59 35.0412465039 -01 50 59.715433102   7.78 7.48     F2-F3IV 45 0

    Equat.    Gal    SGal    Ecl

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2019.10.18-02:05:33

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