J/A+A/614/A3 6 cold-gas-bearing debris-disc stars spectra (Rebollido+, 2018)
The co-existence of hot and cold gas in debris disc.
Rebollido I., Eiroa C., Montesinos B., Maldonado J., Villaver E., Absi O.,
Bayo A., Canovas H., Carmona A., Chen Ch., Ertel S., Garufi A., Henning T.,
Iglesias D.P., Launhardt R., Liseau R., Meeus G., Moor A., Mora A.,
Olofsson J., Rauw G., Riviere-Marichalar P.
<Astron. Astrophys. 614, A3 (2018)>
=2018A&A...614A...3R 2018A&A...614A...3R (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Comets ; Spectroscopy
Keywords: star: general - planetary systems - comets: general - ISM: clouds -
circumstellar matter
Abstract:
Debris discs have often been described as gas-poor discs as the
gas-to-dust ratio is expected to be considerably lower than in
primordial, protoplanetary discs. However, recent observations have
confirmed the presence of a non-negligible amount of cold gas in the
circumstellar (CS) debris discs around young main-sequence stars. This
cold gas has been suggested to be related to the outgassing of
planetesimals and cometary-like objects.
The goal of this paper is to investigate the presence of hot gas in
the immediate surroundings of the cold-gas-bearing debris-disc central
stars.
High-resolution optical spectra of all currently known
cold-gas-bearing debris-disc systems, with the exception of beta Pic
and Fomalhaut, have been obtained from La Palma (Spain), La Silla
(Chile), and La Luz (Mexico) observatories. To verify the presence of
hot gas around the sample of stars, we have analysed the CaII H&K and
the NaI D lines searching for non-photospheric absorptions of CS
origin, usually attributed to cometary-like activity.
Description:
Spectra obtained with Mercator (La Palma, Spain), NOT (La Palma,
Spain) and Tigre (La Luz, Mexico) echelle spectrographs.
Observation dates range from September 2015 to July 2016.
They were reduced using instrument pipelines. Barycentric correction
has been applied to all spectra.
Objects:
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RA (ICRS) DE Designation(s)
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01 34 37.78 -15 40 34.9 49 Cet = * 49 Cet
03 31 53.65 -25 36 50.9 HD 21997 = HD 21997
05 02 27.44 +07 27 39.7 HD 32297 = HD 32297
15 35 16.11 -25 44 03.0 HIP 76310 = HD 138813
16 19 29.24 -21 24 13.3 HIP 79977 = HD 146897
12 32 04.23 -16 11 45.6 eta Crv = * eta Crv
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 118 117 List of spectra
sp/* . 117 Individual spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
10 A1 --- Band [BR] Band for HD 21997
12- 23 F12.8 deg RAdeg Right ascension (J2000)
25- 36 F12.8 deg DEdeg Declination (J2000)
38- 63 A26 --- Obs.Date Date of observation, YYYY-MM/DDThh:mm:ss.ssssss
65- 72 I8 Kibyte Size Size of each file
74-118 A45 --- FileName Name of the spectrum in subdirectory sp
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 18 F18.13 0.1nm lambda Wavelength
20- 49 E30.24 --- Flux ?=- Flux
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Acknowledgements:
Isabel Rebollido, isabel.rebollido(at)uam.es
(End) Isabel Rebollido [UAM], Patricia Vannier [CDS] 02-Feb-2018