Investigation of the variability of bright Be stars using HIPPARCOS photometry

Details Investigation of the variability of bright Be stars using HIPPARCOS photometry Investigation of the variability of bright Be stars using HIPPARCOS photometry

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335..565h&link_type=abstract

Astronomy and Astrophysics, v.335, p.565-572 (1998)

Statistics

80

Stars: Emission-Line, Be, Oscillations, Statistics, Variables: Other

Scientific paper

The high accuracy and the homogeneity of Hipparcos data for bright stars have allowed us to quantify the degree of variability of Be stars. This degree has been found to be highly dependent on the temperature of the star. Rapid variability is the main feature of the 86% of early Be and less than 20% of late Be stars taking into account the limit of detection considered. In addition to Be stars reported in the Hipparcos catalogue (ESA 1997) as short-period variables, we have been able to enlarge the number of detections as well as to confirm periods previously determined. Be stars that show larger amplitude rapid variations are proposed as candidates for a search of multiperiodicity i.e. as non-radial pulsators. We have also searched for the presence of outbursts and fading events in the Hipparcos data. Outbursts have been frequently and preferentially detected in early Be stars with rather low to moderate v sini while fading events seem to be more conspicuous in stars with higher v sini. Mid-term and long-term variations have also been investigated. Several stars have shown some evidence of temporary quasi-periodic oscillations ranging between 10 and 200 days. Finally information concerning long-term variations is reported. Cycles shorter than or equal to the Hipparcos mission have mainly been detected in stars earlier than B6. Long-term time scales of late Be stars are confirmed to be longer by far. Tables 1 and 2 are only available in electronic form at CDS via ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

Affiliated with

Also associated with

No associations

Rating

Investigation of the variability of bright Be stars using HIPPARCOS photometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Investigation of the variability of bright Be stars using HIPPARCOS photometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Investigation of the variability of bright Be stars using HIPPARCOS photometry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1340964