2003A&A...408..971H


Query : 2003A&A...408..971H

2003A&A...408..971H - Astronomy and Astrophysics, volume 408, 971-979 (2003/9-4)

High resolution spectroscopy of circumstellar material around A stars.

HEMPEL M. and SCHMITT J.H.M.M.

Abstract (from CDS):

We have analysed a time series of high resolution spectra (R=217000) of the Caii K line of 9 stars which are candidates for the presence of circumstellar material from our previous studies. We have searched for variable narrow absorption components similar to those extensively studied in the case of β Pictoris. Our data show long-term variations in the spectra of HR 2550 and HR 3685 which can be attributed to the dynamics of circumstellar gas. About one third of the sample stars show variable line absorption but only β Pictoris seems to exhibit uniquely strong variations on short (nightly) timescales. In order to examine possible interstellar contributions we compared our results with interstellar data from the literature. The column densities of our absorption features are up to three orders of magnitude higher than those found for the Local Interstellar Cloud.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - ISM: atoms - stars: individual: β Pictoris

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 - 2022
#notes
1 NAME G Cloud Cld 03 00 +50.2           ~ 67 0
2 NAME LIC Cld 04 41 +31.           ~ 274 0
3 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1789 1
4 * alf Pic PM* 06 48 11.45512 -61 56 29.0008   3.48 3.30     A8VnkA6 166 0
5 * del Vel EB* 08 44 42.22658 -54 42 31.7493   2.00 1.95     A2IV+A4V+F8V 191 0
6 * bet Car PM* 09 13 11.97746 -69 43 01.9473 1.72 1.69 1.69 1.63 1.61 A1III- 218 0
7 HD 109573 PM* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774 7.25 5.81 A0V 594 1
8 V* MO Hya dS* 12 51 57.8968126608 -26 44 17.772380448   6.358 6.141     F0VkA1mA1_lB 120 0
9 * psi Cen PM* 14 20 33.4322870 -37 53 07.055140 3.91 4.006 4.034 6.13 8.45 A0IV 99 0
10 * c Oph Be* 17 31 24.9541340 -23 57 45.513592 4.75 4.81 4.81 4.74 4.72 A0V 264 0
11 * alf Oph ** 17 34 56.06945 +12 33 36.1346 2.32 2.22 2.07 1.93 1.85 A5IVnn 461 0

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2022.08.09-03:45:06

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