# Discovery of the New Slowly Pulsating B Star HD 163830 (B5 II/III) from MOST Space-based Photometry

@article{Aerts2006DiscoveryOT,
title={Discovery of the New Slowly Pulsating B Star HD 163830 (B5 II/III) from MOST Space-based Photometry},
author={C. Aerts and P. D. Cat and R. Kuschnig and J. Matthews and D. Guenther and A. Moffat and S. Rucinski and D. Sasselov and G. Walker and W. Weiss},
journal={The Astrophysical Journal},
year={2006},
volume={642}
}
We report the discovery of a new slowly pulsating B star, with the largest number of detected frequencies to date by more than a factor of 3, based on 37 days of MOST (Microvariability and Oscillations of STars) satellite guide star photometry. The star HD 163830 (V = 9.3, B5 II/III) varies in 20 detected frequencies in the range 0.035-1.06 day-1 (0.4-12.3 μHz) with amplitudes from 0.7 to 7.6 mmag (with a signal-to-noise ratio from 4 to 41). Eighteen of these frequencies are consistent with low… Expand
32 Citations

#### Figures and Tables from this paper

New SPB stars in the field of the young open cluster NGC 2244 discovered by the MOST photometric satellite
During two weeks of nearly continuous optical photometry of the young open cluster NGC 2244 obtained by the MOST satellite, we discovered two new SPB stars, GSC 00154-00785 and GSC 00154-01871. WeExpand
MOST observations of the young open cluster NGC 2264
Context. Photometric time series obtained from space are one of the best ways to study pulsations in pre-main sequence (PMS) stars, especially as the corresponding amplitudes are at theExpand
High-precision CoRoT space photometry and fundamental parameter determination of the B2.5V star HD 48977
We present the CoRoT light curve of the bright B2.5V star HD 48977 observed during a short run of the mission in 2008, as well as a high-resolution spectrum gathered with the HERMES spectrograph atExpand
CoRoT’s view on variable B8/9 stars: spots versus pulsations - Evidence for differential rotation in HD 174648
Context. There exist few variability studies of stars in the region in the Hertzsprung-Russell diagram between the A and B-star pulsational instability strips. With the aid of the high precisionExpand
MOST photometry of the enigmatic PMS pulsator HD 142666
Context. Modeling of pre-main sequence (PMS) stars through asteroseismology of PMS p-mode pulsators has only recently become possible, and spacebased photometry is one of the important sources ofExpand
Stellar variability in open clusters - I. A new class of variable stars in NGC 3766
• Physics
• 2013
Aims. We analyze the population of periodic variable stars in the open cluster NGC 3766 based on a 7-year multi-band monitoring campaign conducted on the 1.2 m Swiss Euler telescope at La Silla,Expand
Multisite spectroscopic seismic study of the β Cep star V2052 Ophiuchi: inhibition of mixing by its magnetic field
We used extensive ground-based multisite and archival spectroscopy to derive observational constraints for a seismic modelling of the magnetic β Cep star V2052 Ophiuchi. The line-profile variabilityExpand
Asteroseismic observations of OB stars
• Physics
• Proceedings of the International Astronomical Union
• 2010
Abstract The region of the hot end of the main-sequence is hosting pulsating stars of different types and flavours. Pulsations are not only observed for Slowly pulsating B stars (mid to late B-typeExpand
Pulsational Analysis of V 588 Mon and V 589 Mon Observed with the MOST and CoRoT Satellites
The two pulsating pre-main sequence (PMS) stars V 588 Mon and V 589 Mon were observed by CoRoT for 23.4 days in 2008 March during the Short Run SRa01 and in 2004 and 2006 by MOST for a total of ~70Expand
MOST Detects g- and p-Modes in the B Supergiant HD 163899 (B2 Ib/II)
The Microvariability and Oscillations of Stars (MOST) satellite observed the B supergiant HD 163899 (B2 Ib/II) for 37 days as a guide star and detected 48 frequencies P2.8 cycles day � 1 withExpand

#### References

SHOWING 1-10 OF 13 REFERENCES
A study of bright southern slowly pulsating B stars* III. Mode identification for singly-periodic targets in spectroscopy
We present the results of the mode identification for a sample of 7 bright southern slowly pulsating B stars showing onepulsation frequency in the XX 413 nm Si II profiles. We combined the resultsExpand
A study of bright southern slowly pulsating B stars. II. The intrinsic frequencies
• Physics
• 2002
We present the results of detailed frequency analyses of a sample of thirteen confirmed slowly pulsating B stars. Our analysis is based on a combination of elaborate photometric and spectroscopicExpand
MOST Detects g-Modes in the Be Star HD 163868*
We have extracted a 37 day light curve with a precision of 0.0012 mag per point for the Microvariability and Oscillations of Stars (MOST) guide star, HD 163868 (B5 Ve). Its rich frequency spectrumExpand
• Physics
• 2005
We present new high-dispersion spectroscopic and precise photometric observations to identify 11 new γ Doradus variables. Seven of these new γ Doradus stars appear to be single, three are primariesExpand
The domain of γ Doradus variables in the Hertzsprung-Russell diagram
70 new γ Doradus candidates were identified from Hipparcos photometry, which represents more than a doubling of the presently known number. Selecting the objects with good evidence forExpand
The opacity mechanism in B-type stars – II. Excitation of high-order g-modes in main-sequence stars
• Physics
• 1993
We show that the OPAL opacities, in addition to explaining the origin of the pulsations of β Cep stars, also predict the existence of a large region in the main-sequence band at lower luminosities,Expand
A calibration of Geneva photometry for B to G stars in terms of Teff, log g and $[M/H]$
• Physics
• 1997
We have used recent Kurucz models and numerous standard stars to improve the calibration of the Geneva photometric system proposed a few years ago. A new photometric diagram for the classification ofExpand
The multiperiodicity of the $\gamma$ Doradus stars HD 224945 and HD 224638 as detected from a multisite campaign
We discuss new photometric data collected on the gamma Dor variables HD 224945 and HD 224638. Multiperiodicity was detected in both stars, thanks to the clear spectral window of a multisite campaignExpand
On non-radial oscillations of B-type stars.
• Physics
• 1993
The excitation mechanisms behind the slow pulsations―with periods of the order of one day―of OB stars are discussed on the basis of numerical computations. Non-radial, non-adiabatic stabilityExpand
Reduction of time-resolved space-based CCD photometry developed for MOST Fabry Imaging data*
The MOST (Microvariability and Oscillations of Stars) satellite obtains ultraprecise photometry from space with high sampling rates and duty cycles. Astronomical photometry or imaging missions in lowExpand