A SEARCH FOR EVIDENCE OF COLD DUST AROUND NAKED T-TAURI STARS

被引:31
作者
SKINNER, SL
BROWN, A
WALTER, FM
机构
[1] UNIV COLORADO,JOINT INST LAB ASTROPHYS,BOULDER,CO 80302
[2] NATL INST STAND & TECHNOL,BOULDER,CO 80309
[3] SUNY STONY BROOK,DEPT EARTH & SPACE SCI,ASTRON PROGRAM,STONY BROOK,NY 11794
关键词
D O I
10.1086/115996
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present results of millimeter/submillimeter photometry of 16 naked T Tauri stars (NTTS), 11 of which lie in the nearby Taurus-Auriga star-forming region. Our objective was to search for evidence of cold circumstellar dust, which could exist around these objects in the form of remnant disks if NTTS evolved from classical T Tauri stars. The only star detected at the primary observing wavelength of 1100-mu-m was V836 Tau, which was also detected at 800-mu-m with an upper limit obtained at 450-mu-m. Its spectral energy distribution longward of 10-mu-m is consistent with that expected for a flat, axisymmetric, moderately active disk of mass approximately 0.04M., assuming a dust opacity law kappa-nu = 0.1(nu/10(12) Hz)1.0 cm2 g-1. Upper limits on the disk masses of undetected stars in Taurus-Auriga are typically 0.02M. (3-sigma), for an assumed temperature greater-than-or-equal-to 6 K at the outer disk radius. We argue that the high levels of magnetic activity found in NTTS may produce detectable gyrosynchrotron emission at millimeter wavelengths, and recommend future high-sensitivity searches for the short-term flux variability characteristic of such emission.
引用
收藏
页码:1742 / 1748
页数:7
相关论文
共 29 条
[1]   SUBMILLIMETER PHOTOMETRY AND DISK MASSES OF T-TAURI DISK SYSTEMS [J].
ADAMS, FC ;
EMERSON, JP ;
FULLER, GA .
ASTROPHYSICAL JOURNAL, 1990, 357 (02) :606-620
[2]   THE DISKS OF T-TAURI STARS WITH FLAT INFRARED-SPECTRA [J].
ADAMS, FC ;
LADA, CJ ;
SHU, FH .
ASTROPHYSICAL JOURNAL, 1988, 326 (02) :865-883
[3]  
[Anonymous], 1988, LICK OBSERVATORY B 1
[4]   A SURVEY FOR CIRCUMSTELLAR DISKS AROUND YOUNG STELLAR OBJECTS [J].
BECKWITH, SVW ;
SARGENT, AI ;
CHINI, RS ;
GUSTEN, R .
ASTRONOMICAL JOURNAL, 1990, 99 (03) :924-945
[5]  
BERTOUT C, 1989, ANNU REV ASTRON ASTR, V27, P351
[6]   OBSERVATIONAL STUDIES OF PRE-MAIN-SEQUENCE EVOLUTION [J].
COHEN, M ;
KUHI, LV .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1979, 41 (04) :743-843
[7]  
Dulk G. A., 1987, COOL STARS STELLAR S, P72
[8]   RADIO-EMISSION FROM THE SUN AND STARS [J].
DULK, GA .
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 1985, 23 :169-224
[9]   A MILLIMETER SUBMILLIMETER COMMON USER PHOTOMETER FOR THE MAXWELL,JAMES,CLERK TELESCOPE [J].
DUNCAN, WD ;
ROBSON, EI ;
ADE, PAR ;
GRIFFIN, MJ ;
SANDELL, G .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1990, 243 (01) :126-132
[10]   STUDY OF TAURUS DARK CLOUD COMPLEX [J].
ELIAS, JH .
ASTROPHYSICAL JOURNAL, 1978, 224 (03) :857-872