The circumstellar gas surrounding 51 Ophiuchi - A candidate proto-planetary system similar to Beta Pictoris
1993; IOP Publishing; Volume: 402; Linguagem: Inglês
10.1086/186700
ISSN1538-4357
Autores Tópico(s)Astronomy and Astrophysical Research
Resumoview Abstract Citations (38) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Circumstellar Gas Surrounding 51 Ophiuchi: A Candidate Proto--Planetary System Similar to beta Pictoris Grady, C. A. ; Silvis, J. M. S. Abstract Combined archival and recent International Ultraviolet Explorer (IUE) observations of the star, 51 Oph, reveal the presence of variable, accreting gas with velocities as large as + 100 km/s relative to the system. The electron number density of the circumstellar gas is comparable to that observed around the candidate proto-planetary system, Beta Pic. In addition to the cooler gas, absorption from Al III, Si IV, and C IV is present over the velocity range of the accreting gas. The presence of Si IV and C IV in the spectrum of a B9.5 star provides evidence for collisional ionization of the circumstellar gas like that observed in Beta Pic. The combination of H-alpha profiles with double emission peaks to comparable strength, together with detection of transient mass ejection events similar to those observed in other Be stars, suggests that the inclination of the 51 Oph system is within 10-15 deg of the equatorial plane. Collectively these data imply that the 51 Oph system is similar to Beta Pic in both system constituents and orientation, and may be in a similar evolutionary state. Publication: The Astrophysical Journal Pub Date: January 1993 DOI: 10.1086/186700 Bibcode: 1993ApJ...402L..61G Keywords: Interstellar Gas; Planetary Systems; Shell Stars; Stellar Envelopes; Stellar Evolution; Absorption Spectra; Ionized Gases; Iue; Stellar Mass Accretion; Astrophysics; STARS: CIRCUMSTELLAR MATTER; STARS: EARLY-TYPE; STARS: INDIVIDUAL CONSTELLATION NAME: 51 OPHIUCHI; ULTRAVIOLET: STARS full text sources ADS | data products SIMBAD (4) MAST (1) INES (1)
Referência(s)