High-resolution infrared spectra of FU Orionis variables - Keplerian rotation and mass loss

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167671· OSTI ID:5557059

Kenyon, S J; Hartmann, L ^[1]

---

1. Harvard Smithsonian Center for Astrophysics, Cambridge, MA (USA)

High-spectral-resolution 2-micron spectroscopy of two FU Ori variables, V1057 Cyg and FU Ori, confirms that the ratio of IR-to-optical v sin i in these objects is significantly smaller than unity. The observed ratio is slightly larger than predictions of simple accretion-disk models but is consistent with strict Keplerian rotation given the uncertainties in the models. Blueshifted CO absorption is observed in FU Ori and in V1057 Cyg, suggesting mass loss at rates less than about 10 to the -7th solar mass/yr from the outer disk regions. The data suggest mass ejection in FU Ori is dominated by flows from inner disk regions. The mass-loss rate in FU Ori appears to be variable. 25 refs.

• OSTI ID: 5557059
• Journal Information: Astrophysical Journal; (USA), Vol. 342; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
VARIABLE STARS
INFRARED SPECTRA
ACCRETION DISKS
ANGULAR VELOCITY
MAIN SEQUENCE STARS
MASS TRANSFER
RESOLUTION
ROTATION
STAR ACCRETION
MOTION
SPECTRA
STAR EVOLUTION
STARS
VELOCITY
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources