2002A&A...385..546C


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.19CEST04:29:05

2002A&A...385..546C - Astronomy and Astrophysics, volume 385, 546-562 (2002/4-2)

ISO LWS Spectra of T Tauri and Herbig AeBe stars.

CREECH-EAKMAN M.J., CHIANG E.I., JOUNG R.M.K., BLAKE G.A. and VAN DISHOECK E.F.

Abstract (from CDS):

We present an analysis of ISO-LWS spectra of eight T Tauri and Herbig AeBe young stellar objects. Some of the objects are in the embedded phase of star-formation, whereas others have cleared their environs but are still surrounded by a circumstellar disk. Fine-structure lines of [OI] and [CII] are most likely excited by far-ultraviolet photons in the circumstellar environment rather than high-velocity outflows, based on comparisons of observed line strengths with predictions of photon-dominated and shock chemistry models. A subset of our stars and their ISO spectra are adequately explained by models constructed by Chiang & Goldreich (1997ApJ...490..368C) and Chiang et al. (2001ApJ...547.1077C) of isolated, passively heated, flared circumstellar disks. For these sources, the bulk of the LWS flux at wavelengths longward of 55µm arises from the disk interior which is heated diffusively by reprocessed radiation from the disk surface. At 45µm, water ice emission bands appear in spectra of two of the coolest stars, and are thought to arise from icy grains irradiated by central starlight in optically thin disk surface layers.

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Journal keyword(s): stars: pre-main sequence - infrared: stars - line: identification - stars: formation

Simbad objects: 8

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Number of rows : 8

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 V* GG Tau Or* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 650 1
2 V* AA Tau Or* 04 34 55.4222683130 +24 28 53.038273587 13.14 13.34 12.20     K5Ve 630 0
3 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 934 2
4 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 396 0
5 HD 36112 Ae* 05 30 27.5286772598 +25 19 57.082162439   8.57 8.27     A8Ve 362 0
6 V* CQ Tau Ae* 05 35 58.4671238887 +24 44 54.086375712 11.290 10.780 10.000   8.33 F5IVe 255 0
7 BD+40 4124 Ae* 20 20 28.2415737117 +41 21 51.527810947 11.11 11.36 10.62 10.510   B2Ve 275 1
8 EM* LkHA 233 Ae* 22 34 40.9923134958 +40 40 04.251892858   14.5       A7Ve 141 0

    Equat.    Gal    SGal    Ecl

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2020.09.19-04:29:05

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