J/MNRAS/465/4723 Log of SALT-RSS observations (Koen+, 2017)
Optical spectra of ultracool dwarfs with the Southern African Large Telescope.
Koen C., Miszalski B., Vaisanen P., Koen T.
<Mon. Not. R. Astron. Soc., 465, 4723-4734 (2017)>
=2017MNRAS.465.4723K 2017MNRAS.465.4723K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, brown dwarf
Keywords: brown dwarfs - stars: flare - stars: low-mass
Abstract:
New spectra of 81 ultracool dwarfs (spectral types M7 and later) are
discussed. Spectral classifications of 49 objects are available in the
literature, while 32 objects are newly classified. The known spectral
types were used to test an automated classification scheme, which
relies primarily on template fitting, supplemented by matching of
spectral indices calibrated against the template spectra. An attempt
was made to quantify the uncertainty in the spectral types, which is
generally better than two subclasses. Objects for which spectral types
differ by more than one subclass from the literature classifications
are discussed individually. Discrepancies between automated
classifications based on, respectively, template fitting and spectral
index matching, may be useful for flagging objects with unusual
spectra. Aside from the 32 first-time classifications, alternative
classifications are presented for 32 previously classified dwarfs.
Very large (equivalent width greater than 130Å) Hα flares
are reported for the known ultracool dwarf binary 2MASS
J15200224-4422419; curiously, the object does not appear to have
quiescent emission lines. Non-zero equivalent-width measurements are
listed for a further 29 objects.
Description:
we obtained spectroscopic observations of many candidates with the
Robert Stobie Spectrograph (RSS) on the queue-scheduled SALT under
programmes 2014-1-RSA-003, 2014-2-MLT-003 and 2015-1-MLT-003.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 38 128 Log of SALT-RSS observations
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMsss)
18- 27 A10 "date" Obs.Date Observation date
29- 38 A10 s EcxTime Exposure time
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Aug-2019