2003A&A...397.1129K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET13:04:10

2003A&A...397.1129K - Astronomy and Astrophysics, volume 397, 1129-1141 (2003/1-3)

Line emission from circumstellar disks around A stars.

KAMP I., VAN ZADELHOFF G.-J., VAN DISHOECK E.F. and STARK R.

Abstract (from CDS):

The nature of the tenuous disks around A stars has raised considerable controversy in the literature during the past decade. The debate whether or not the disk around β Pictoris contains gaseous molecular hydrogen is only the most recent example. Since CO is in general a poor tracer for the gas content of these low mass disks, we discuss here detailed emission line calculations for alternative tracers like C and C+, based on recent optically thin disk models by Kamp & van Zadelhoff (2001A&A...373..641K). The [CII] 157.7µm line was searched toward Vega and β Pictoris - the most prominent A stars with disks - using ISO LWS data, and a tentative detection is reported toward the latter object. From a comparison with emission line observations as well as absorption line studies of both stars, the gas-to-dust ratio is constrained to lie between 0.5 and 9 for β Pictoris. For Vega the [CII] observations indicate an upper limit of 0.2M for the disk gas mass. Predicted line intensities of C+ and C are presented for a range of models and appear promising species to trace the gas content in the disks around A stars with future instrumental capabilities (SOFIA, Herschel, APEX and ALMA). Searches for CO emission should focus on the J=3-2 line.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: planetary systems: protoplanetary disks - stars: early-type - stars: individual: β Pictoris - stars: individual: Vega

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1695 1
2 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 564 1
3 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2538 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-13:04:10

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