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Spectral analysis of water vapour in cool stars

Jones, HRA; Pavlenko, Y; Viti, S; Tennyson, J; (2002) Spectral analysis of water vapour in cool stars. Monthly Notices of the Royal Astronomical Society , 330 (3) 675 - 684. 10.1046/j.1365-8711.2002.05090.x. Green open access

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Abstract

M-star spectra, at wavelengths beyond 1.35 mum, are dominated by water vapour, yet terrestrial water vapour makes it notoriously difficult to obtain accurate measurement from ground-based observations. We have used the short-wavelength spectrometer on the Infrared Space Observatory at four wavelength settings to cover the 2.5-3.0 mum region for a range of M stars. The observations show a good match with previous ground-based observations and with synthetic spectra based on the Partridge & Schwenke line list. although not with the SCAN line list. We have used a least-squared minimization technique to systematically find best-fitting parameters for the sample of stars. The temperatures that we find indicate a relatively hot temperature scale for M dwarfs. We consider that this could be a consequence of problems with the Partridge & Schwenke line list which leads to synthetic spectra predicting water bands that are too strong for a given temperature. Such problems need to be solved in the next generation of water vapour line lists, which will extend the calculation of water vapour to higher energy levels with the good convergence necessary for reliable modelling of hot water vapour. Then water bands can assume their natural role as the primary tool for the spectroscopic analysis of M stars.

Type: Article
Title: Spectral analysis of water vapour in cool stars
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.2002.05090.x
Publisher version: http://dx.doi.org/10.1046/j.1365-8711.2002.05090.x
Language: English
Additional information: © 2002 RAS
Keywords: Stars abundances, Star atmospheres Fundamental parameters, Late-type stars, Brown dwarfs, Low-mass stars, Effective temperature scale, M-dwarfs, Infrared photometry, Ab-initio, Energy-distributions, Stellar atmospheres, absorption-lines, CM Draconis, M-subdwarfs
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/100951
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