1999ApJ...517..256K


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET00:47:00

1999ApJ...517..256K - Astrophys. J., 517, 256-263 (1999/May-3)

Near-infrared spectropolarimetry of three prototype low-mass young stellar objects in the Taurus dark cloud.

KOBAYASHI N., NAGATA T., TAMURA M., TAKEUCHI T., TAKAMI H., KOBAYASHI Y. and SATO S.

Abstract (from CDS):

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 µm, while it shows a flat polarization curve with high polarization in optical wavelengths and a slowly decreasing slope with small polarization in 3-4 µm. 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 µm, 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.

Abstract Copyright:

Journal keyword(s): ISM: Dust, Extinction - ISM: Jets and Outflows - Polarization - Scattering - Stars: Formation - Stars: Pre-Main-Sequence

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME T Tau S ** 04 21 59.371 +19 32 05.95           K7 137 2
2 V* T Tau TT* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1239 2
3 NAME T Tau N *i* 04 21 59.433 +19 32 06.42   11.22 10.12 9.80   K1.5 163 1
4 HBC 393 FU* 04 31 34.077 +18 08 04.90           K3V/M3III 773 2
5 V* HL Tau TT* 04 31 38.437 +18 13 57.65   16.02 15.10 14.21   K5 1128 0
6 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 797 0
7 V* XZ Tau TT* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 402 1
8 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3320 0
9 V* V2254 Ori Or* 05 35 14.113 -05 22 22.73           B 277 2
10 BD-06 1253 Ae* 05 36 25.4313245626 -06 42 57.684449700   11.65 10.9 10.29   A1e 402 1
11 RAFGL 2591 Y*O 20 29 25.2650 +40 11 26.532   18       ~ 562 5

    Equat.    Gal    SGal    Ecl

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2019.11.14-00:47:00

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