Observations of infrared emission lines and radio continuum emission from pre-main-sequence objects

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165550· OSTI ID:5554316

Evans, II, N J; Levreault, R M; Beckwith, S; Skrutskie, M

Moderate-resolution observations of the Br-alpha, Br-gamma, Pf-gamma, and H2 v = 1 - 0S(1) emission lines are presented for 16 premain-sequence stars, most of which are low-mass (M less than 5 solar masses) objects. Brackett line emission was detected in nine of 16 objects. H2 emission was confirmed in T Tauri and probably detected in MWC 1080 and L1551 IRS 5. Radio continuum observations at 6 cm are also presented. These results are compared to the predictions of existing models for stellar winds. The results are also compared to the data on molecular outflows. As has been found for higher mass stars, the mass-loss rates derived from CO would imply stronger infrared line and radio continuum emission than were observed. A number of explanations for this discrepancy are discussed, and it is concluded that largely neutral winds provide the most attractive explanation. 69 references.

• Research Organization: Texas Univ., Austin; Cornell Univ., Ithaca, NY
• OSTI ID: 5554316
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 320; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ERUPTIVE VARIABLE STARS
INFRARED SPECTRA
MASS
MATHEMATICAL MODELS
RADIATIONS
RADIOWAVE RADIATION
SPECTRA
STAR MODELS
STARS
STELLAR ACTIVITY
STELLAR WINDS
T TAURI STARS
VARIABLE STARS