ArasBeAm

Updated expected period for several stars

Friday 29 August 2008 by Francois Cochard

Olivier Thizy prepared a list of known stars, for which the expected observation period should be shortened (based on Anatoly Miroshnichenko’s presentation in Heidelberg, may 2008). I’ve included these modification in ArasBeAm. Here is his message :

- delta Sco [7 days]: continuous monitoring is key, specially as it approached periastron (Feb-May 2011); seem its disk recently evolved toward a ring... very interesting star to follow.
- gamma Cas [180 days] is still interesting to get spectra from time to time; EW is evolving
- 48 Lib [90 days]: very interesting, V/R ratio is growing since few years; to monitor
- bet CMi [60 days]: late Be star, symetrical V/R but radial velocity to monitor. 700 days period? Need more data there to constraint a period...
- phi Per [90 days]: EW changed, down from 48 to now around 36-38. Bright Be binary candidates to monitor?
- 66 Oph [180 days]: double peak spectrum, more southern but interesting to look at. Peak separation changed between the 1990’s and now. Is disk dissipating?
- omi Cas [180 days]: no emission lines in 1970’s; Intensity around 4 in 1990’s and now around 6. Is the emission single-peak or triple? Concentration of material in a Roche lob with presence of a companion? EW is now reaching 40A (was 20 in the 1990’s!).
- pi Aqr [60 days]: single peak in 1982, double peak after, then in 1996 absorption line with a single line swinging with a period of 84 days. It is worth to continuous monitor this star now.
- ups Sgr [90 days]: was the subject of study of a pro; interesting Be star spectrum merged with a later type star, lot of absorption lines in the spectrum.
- EW Lac: [90 days] bright Be binary candidates to monitor (EW: 46
- V777 Cas [90 days]: bright Be binary candidates to monitor (EW: 20-45)
- V695 Mon [90 days]: bright Be binary candidates to monitor (EW: 45)
- HD206773 [90 days]: bright Be binary candidates to monitor (EW: 0-43)
- 105 Tau [90 days]: bright Be binary candidates to monitor (EW: 42)
- HD208682 [90 days]: bright Be binary candidates to monitor (EW: 41)
- HD202904 [90 days]: bright Be binary candidates to monitor
- DX Eri [90 days]: bright Be binary candidates to monitor
- nu Gem [90 days]: bright Be binary candidates to monitor

François


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