A Spectroscopic Technique for Measuring Stellar Properties of Pre-Main-Sequence Stars
نویسندگان
چکیده
منابع مشابه
A Spectroscopic Technique for Measuring Stellar Properties of Pre–Main Sequence Stars
We describe a technique for deriving effective temperatures, surface gravities, rotation velocities, and radial velocities from high resolution near–IR spectra. The technique matches the observed near–IR spectra to spectra synthesized from model atmospheres. Our analysis is geared toward characterizing heavily reddened pre–main sequence stars but the technique also has potential applications in...
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In this paper, we present the results of smoothed particle hydrodynamic (SPH) simulations of collisions between pre-main sequence stars and a variety of other kinds of stars. Simulations over a range of impact parameters and velocities were performed. We find that pre-main sequence stars tend to “wrap themselves” around their impactor. We discuss the probable evolutionary state of products of c...
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We present high resolution (R=50,000) spectra at 2.2 µm of 16 young stars in the ρ Ophiuchi dark cloud. Photospheric features are detected in the spectra of 11 of these sources, all Class II young stellar objects. The 5 featureless spectra consist of 2 Class I, 2 Class I.5, & 1 Class II. One star, GSS 29, is identified as a spectroscopic binary based on radial velocity variations. The radial ve...
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The study of pre-main sequence stellar coronae is undertaken in many different wavelength regimes, with apparently conflicting results. X-ray studies of T Tauri stars suggest the presence of loops with a range of sizes ranging from less than a stellar radius to 10 stellar radii. Some of these stars show a clear rotational modulation in X-rays, but many do not and indeed the nature of this emiss...
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The position of pre-main-sequence or protostars in the Hertzsprung–Russell diagram is often used to determine their mass and age by comparison with pre-main-sequence evolution tracks. On the assumption that the stellar models are accurate, we demonstrate that, if the metallicity is known, the mass obtained is a good estimate. However, the age determination can be very misleading because it is s...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2003
ISSN: 0004-6256,1538-3881
DOI: 10.1086/379292