Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-29
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the Astronomical Journal. 37 pages, 8 figures
Scientific paper
10.1086/378958
We present high resolution (R=50,000) spectra at 2.2 um of 16 young stars in the rho Ophiuchi dark cloud. Photospheric features are detected in the spectra of 11 of these sources, all Class II young stellar objects. In 10 of these sources, we measure effective temperatures, continuum veiling, and vsini rotation from the shapes and strengths of atomic photospheric lines by comparing to spectral synthesis models at 2.2 um. We measure surface gravities in 2 stars from the integrated line flux ratio of the 12CO line region at 2.3 um and the Na I line region at 2.2 um. Although the majority (8/10) of the Class II stars have similar effective temperatures (3530 K +/-100 K), they exhibit a large spread in bolometric luminosities (factor ~8), as derived from near-IR photometry. In the two stars where we have surface gravity measurements from spectroscopy, the photometrically derived luminosities are systematically higher than the spectroscopic luminosities. Our spectroscopic luminosities result in older ages on the H-R diagram than is suggested by photometry at J or K. Most of our sources show a substantially larger amount of continuum excess than stellar flux at 2.2 um. The derived veiling values at K appear correlated with mid-IR disk luminosity, and with Brackett gamma equivalent width, corrected for veiling. The derived vsini rotation is substantial (12-39 km s-1), but systematically less than the rotation measured in Class I.5 (flat) and Class I sources from other studies in Ophiuchus.
Doppmann Greg W.
Jaffe Daniel T.
White Richard J.
No associations
LandOfFree
Stellar Properties of Pre-Main Sequence Stars from High Resolution Near-IR Spectra 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 Stellar Properties of Pre-Main Sequence Stars from High Resolution Near-IR Spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar Properties of Pre-Main Sequence Stars from High Resolution Near-IR Spectra will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-258201