Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.212..107g&link_type=abstract
Astrophysics and Space Science, vol. 212, nos. 1-2, p. 107-114
Astronomy and Astrophysics
Astrophysics
2
A Stars, B Stars, Extrasolar Planets, Herbig-Haro Objects, Late Stars, Protoplanets, Stellar Envelopes, Stellar Mass Accretion, Detection, Emission Spectra, Ionization, Iue, Pre-Main Sequence Stars, Stellar Spectra, Ultraviolet Spectra
Scientific paper
We present archival and recent IUE high dispersion spectra of late B stars which reveal the presence of accreting gas with velocities as high as 350 km/s, collisional ionization of the accreting gas to temperatures above the stellar Teff, and column densities intermediate between those observed toward classical Herbig Ae/Be stars and the nearby proto-planetary system beta Pictoris. One of the stars, HD 176386, while lacking obvious optical signatures of youth, is a member of the R CrA star formation region, and with an inferred age of 2.8 Myr has not yet arrived on the zero-age main sequence (ZAMS). The other object, an isolated, field B star with pronounced IR excess due to warm, circumstellar dust, 51 Oph, exhibits only modest H(alpha) emission. The combination of high velocity, accreting gas in systems with IR excesses due to circumstellar dust suggests that not only are these objects candidate proto-planetary systems, but that they may represent an extension to higher stellar masses of the weak-emission pre-main sequence (PMS) stars.
Grady Carol A.
Perez Mario R.
Thé Pik-Sin
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