2007A&A...472..565G


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST19:07:36

2007A&A...472..565G - Astronomy and Astrophysics, volume 472, 565-570 (2007/9-3)

Multiperiodic pulsations in the Be stars NW Serpentis and V1446 Aquilae.

GUTIERREZ-SOTO J., FABREGAT J., SUSO J., SUAREZ J.C., MOYA A., GARRIDO R., HUBERT A.-M., FLOQUET M., NEINER C. and FREMAT Y.

Abstract (from CDS):

We present accurate photometric time series of two Be stars: NW Ser and V1446 Aql. Both stars were observed at the Observatorio de Sierra Nevada (Granada) in July 2003 with an automatic four-channel Stroemgren photometer. We also present a preliminary theoretical study showing that the periodic variations exhibited by these stars can be due to pulsation. An exhaustive Fourier analysis together with a least-square fitting has been carried out on the time series for all four Stroemgren bands. Several independent frequencies and non-periodic trends explain most of the variance. A theoretical non-adiabatic code applied to stellar models for these stars shows that g-modes are unstable. Both stars show rapid variations in amplitude, probably due to a beating phenomenon. Four significant frequencies have been detected for each star. Comparison of the observed amplitude ratios for each pulsational frequency with those calculated from theoretical pulsation codes allows us to estimate the pulsation modes associated with the different detected frequencies. NW Ser seems also to show unstable p-modes and thus could be one of the newly discovered β Cephei and SPB hybrid stars. Further spectroscopic observations are planned to study the stability of the detected frequencies.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: emission-line, Be - stars: individual: NW Serpentis - stars: individual: V1446 Aquilae

VizieR on-line data: <Available at CDS (J/A+A/472/565): tablea1.dat tablea2.dat>

Simbad objects: 8

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Number of rows : 8

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 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1705 2
2 HD 163868 Be* 17 59 56.4312436919 -33 24 29.984102749 6.69 7.311 7.354     B2/3(V)ne 61 0
3 HD 168797 Be* 18 21 28.4010410086 +05 26 08.558219035 5.47 6.09 6.13     B2Vne 115 0
4 HD 170200 SB* 18 27 58.7736798192 +06 11 38.762172779 5.33 5.665 5.699     B8III 87 0
5 BD+03 3736 * 18 31 56.0385470002 +03 50 31.199550123   8.92 8.57     B8 2 0
6 HD 178598 * 19 09 31.6735878754 -06 57 44.368139210   9.74 9.40     B5III 5 0
7 HD 179405 Be* 19 12 40.2545697620 -06 27 31.695600184 8.72 9.40 9.12     B2Vnne 30 0
8 HD 179846 * 19 14 20.8233779285 -05 41 32.578678487   8.56 8.28     B9II 7 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-19:07:36

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