Astronomy and Astrophysics, volume 620A, 145-145 (2018/12-1)
Short-term variability and mass loss in Be stars. IV. Two groups of closely spaced, approximately equidistant frequencies in three decades of space photometry of ν Puppis (B7-8 IIIe).
BAADE D., PIGULSKI A., RIVINIUS T., WANG L., MARTAYAN C., HANDLER G., PANOGLOU D., CARCIOFI A.C., KUSCHNIG R., MEHNER A., MOFFAT A.F.J., PABLO H., RUCINSKI S.M., WADE G.A., WEISS W.W. and ZWINTZ K.
Abstract (from CDS):
Context. In early-type Be stars, groups of nonradial pulsation (NRP) modes with numerically related frequencies may be instrumental for the release of excess angular momentum through mass-ejection events. Difference and sum/harmonic frequencies often form additional groups.
Aims. The purpose of this study is to find out whether a similar frequency pattern occurs in the cooler third-magnitude B7-8 IIIe shell star ν Pup.
Methods. Time-series analyses were performed of space photometry with BRITE-Constellation (2015, 2016/17, and 2017/18), SMEI (2003-2011), and HIPPARCOS (1989-1993). Two IUE SWP and 27 optical echelle spectra spanning 20 years were retrieved from various archives.
Results. The optical spectra exhibit no anomalies or well-defined variabilities. A magnetic field was not detected. All three photometry satellites recorded variability near 0.656c/d which is resolved into three features separated by ∼0.0021c/d. Their first harmonics and two combination frequencies form a second group, whose features are similarly spaced by 0.0021c/d. The frequency spacing is very nearly but not exactly equidistant. Variability near 0.0021c/d was not detected. The long-term frequency stability could be used to derive meaningful constraints on the properties of a putative companion star. The IUE spectra do not reveal the presence of a hot subluminous secondary.
Conclusions. ν Pup is another Be star exhibiting an NRP variability pattern with long-term constancy and underlining the importance of combination frequencies and frequency groups. This star is a good target for efforts to identify an effectively single Be star.
© ESO 2018
asteroseismology - stars: emission-line, Be - stars: mass-loss - techniques: photometric - stars: rotation
VizieR on-line data:
<Available at CDS (J/A+A/620/A145): smei.dat bhr2015.dat bhr2017.dat bhr2018.dat blb2017.dat btr2017.dat>
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