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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz


IMPACT FACTOR 2018: 0.350

CiteScore 2018: 0.24

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Source Normalized Impact per Paper (SNIP) 2018: 0.144

ICV 2017: 121.03

Open Access
Online
ISSN
2543-6376
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Volume 12, Issue 4

Issues

Selecting a Photometric System for Gaia: C, N, O and Alpha-Process Elements

G. Tautvaišienė
  • Corresponding author
  • Institute of Theoretical Physics and Astronomy, Vilnius University, Goštauto 12, Vilnius, LT-01108, Lithuania
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ B. Edvardsson
  • Department of Astronomy and Space Physics, Uppsala Astronomical Observatory, Box 515, SE-751 20 Uppsala, Sweden
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ S. Bartašiūtė
Published Online: 2017-02-08 | DOI: https://doi.org/10.1515/astro-2017-0077

Abstract

The sensitivity of stellar spectra to C, N, O and α-process element abundances is discussed with the aim of taking this effect into account when selecting a photometric system for the Gaia orbiting observatory. On the basis of a spectrometric, photometric and theoretical study of spectra of evolved first-ascent giants and clump stars in the open cluster NGC 7789 it is demonstrated that evolutionary alterations of carbon and nitrogen abundances can cause noticeable spectral changes and, if not taken into account, may yield misleading photometric [Fe/H] determinations. Carbon features in stellar atmospheres show a particularly complex behavior being dependent on mixing processes in stars, on the stellar surface gravity and on the abundance of oxygen which can also be altered by different reasons. NH bands could serve for the evaluation of mixing processes in stars and the interpretation of carbon dominated spectral regions. Abundances of α-process elements can be evaluated photometrically by using the direct indicators - Ca II H and K lines and Mg I b triplet.

Keywords: techniques; photometric; stars; abundances; orbiting observatories; Gaia

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About the article

Received: 2003-10-15

Published Online: 2017-02-08

Published in Print: 2003-12-01


Citation Information: Open Astronomy, Volume 12, Issue 4, Pages 532–538, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0077.

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© 2017. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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