Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.4104p&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #41.04; Bulletin of the American Astronomical Society, Vol. 25, p.1352
Other
Scientific paper
The surprising and unpredicted detection of strong and highly redshifted Lyman alpha emission in several young stellar objects (YSOs) by IUE, which has been interpreted as the signature of accreting material in the line of sight, has added a new and important diagnostic to the current theory of accretion. Until recently, previous work on YSOs relied on either subordinate lines of hydrogen or trace species and did not involve the resonance transition of the most cosmically abundant element. Based on high-dispersion images of the short wavelength camera (SWP) of several YSOs has been possible to measure redshifted emission velocities in excess of +800 km/s and mass accretion rates of the order of 10(-7) M_&sun;/yr. In contrast, chromospheric Lyman alpha emission is typically symmetric with respect to the geocoronal emission. It has been also possible to detect the Lyman alpha stellar emission in several low-dispersion SWP images of objects such as RW Aur, HD 31648, and possibly UX Ori and BF Ori. We present results of our ongoing Lyman alpha survey and discuss correlations of its strength with other emission lines and with additional accretion diagnostics such as infrared excesses, blueing effect, and flux variabilities.
Blondel P. F. C.
de Winter Dolf
Grady Carol A.
Perez Mario R.
Thé Pik-Sin
No associations
LandOfFree
Lyman alpha as an Accretion Diagnostic in Young Stellar Objects 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 Lyman alpha as an Accretion Diagnostic in Young Stellar Objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lyman alpha as an Accretion Diagnostic in Young Stellar Objects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-778637