Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...517..256k&link_type=abstract
The Astrophysical Journal, Volume 517, Issue 1, pp. 256-263.
Astronomy and Astrophysics
Astronomy
8
Ism: Dust, Extinction, Ism: Jets And Outflows, Polarization, Scattering, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
We present near-infrared spectropolarimetric data between 0.9 and 4.2 μm for three prototypes of low-mass young stellar objects (YSOs), L1551 IRS 5, HL Tau, and T Tau in the Taurus dark cloud. These sources are in different classes in the standard spectral classification scheme of low-mass YSOs by Lada. The polarization curves of the observed sources show distinct differences. The class I protostar L1551 IRS 5 shows a flat polarization curve with high polarization through the observed wavelengths. It also shows a polarization excess at the 3.1 μm ice band absorption feature. The ``flat-spectrum source'' HL Tau, which is thought to be in a transient phase from class I to class II, shows a steep decrease of polarization with increasing wavelengths from 1.0 to 2.5 mum, while it shows a flat polarization curve with high polarization in optical wavelengths and a slowly decreasing slope with small polarization in 3-4 mum. The class II source T Tau displays small polarization no more than 2% through the observed wavelengths; the polarization in the shorter wavelengths from optical to 1.3 μm decreases with increasing wavelengths. T Tau also shows an increasing polarization curve in the longer wavelengths over 1.6 mum, which is most likely to come from the infrared companion T Tau S (Kobayashi et al.). The prominent differences of the observed near-infrared polarization curves can be clearly understood in terms of the standard spectral classification scheme of low-mass YSOs. Thus near-infrared spectropolarimetry could serve as a potentially powerful diagnostic of circumstellar material, complementary to the standard spectral classification.
Kobayashi Naoto
Kobayashi Yukiyasu
Nagata Tetsuya
Sato Shuji
Takami Hideki
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