Luminosities and Velocities of OBN Stars from HIPPARCOS

Details Luminosities and Velocities of OBN Stars from HIPPARCOS Luminosities and Velocities of OBN Stars from HIPPARCOS

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..303m&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 303-306

Astronomy and Astrophysics

Astronomy

Scientific paper

A hundred N enhanced or N rich O-B stars (OBN) have been observed by the European Hipparcos satellite, including five objects investigated for PSR companions (Philp et al. 1996, Sawyer et al. 1996). By implementing with radial velocity the astrometric data kindly supplied by the Hipparcos project (ESA 1997) we have inferred absolute visual magnitudes, galactocentric positions and velocities of ninety OBN stars. By ignoring nine outliers the OBN stars show average galactocentric distances R_g = 8.58 +/- 0.04 (s.e.) kpc, |Z| = 60 +/- 5 pc and space velocities X_g = 0 +/- 2, Y_g = 219 +/- 1, Z_g = 0 +/- 1; velocity with respect to the LSR V_(lsr) = 17 +/- 1 km/s. The absolute visual magnitudes, after correcting for IS absorbtion are, on the average, larger (fainter) by 0.9 +/- 0.2, from those inferable from spectral type and luminosity class (Lang 1992) for 42 single stars. The bulk of OBN stars behave like common O-B stars and evolves in the same space with akin kinematics. Only 3 bona fide runaway stars are recognized among ninety OBN's: HIP 18614, 70574 and 92198. The first object does not possess a PSR companion. HIP 70574, with galactocentric space velocity of 390 km/s, might have been ejected from a disrupted binary by an SNII event. Subluminous, by 3 to 4 +/- 1 mag, OBN stars, are recognized among OBN objects with NIII emission lines. Five subluminous ON stars are suggested to being evolving from O to the recently identified sdO stage (Dreizler 1993).

Affiliated with

Also associated with

No associations

Rating

Luminosities and Velocities of OBN Stars from HIPPARCOS 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 Luminosities and Velocities of OBN Stars from HIPPARCOS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Luminosities and Velocities of OBN Stars from HIPPARCOS will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1879097