Detailed photospheric abundances of 28 Peg and HD 202240

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ELMASLI AKÇAR A., ÇALIŞKAN TÜRKSOY Ş., KILIÇOĞLU T., Unal K., Nasolo Y., Albayrak B.

NEW ASTRONOMY, cilt.42, ss.38-41, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 42
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.newast.2015.06.008
  • Dergi Adı: NEW ASTRONOMY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.38-41
  • Anahtar Kelimeler: Stars:individual:28 Peg, Stars:individual:HD 202240, Stars:abundances, Technique:spectroscopic, A-TYPE STARS, LINE-DATA-BASE, ROTATIONAL VELOCITIES, CHEMICAL-COMPOSITION, NORTHERN-HEMISPHERE, OPEN CLUSTER, ISOCHRONES, PHOTOMETRY, MEMBERS, TRACKS
  • Ankara Üniversitesi Adresli: Evet

Özet

The atmospheric parameters and chemical abundances of two neglected A-type stars, 28 Peg and HD 202240, were derived using high resolution spectra obtained at the TUBITAK National Observatory. We determined the photospheric abundances of 11 elements for 28 Peg and 20 for HD 202240, using equivalent-width measurement and spectral synthesis methods. Their abundance patterns are in good agreement with those of chemically normal A-type stars having similar atmospheric parameters. We pinpoint the position of these stars on the H-R diagram and estimate their masses and ages as; 2.60 +/- 0.10 M-circle dot and 650 +/- 50 Myr for 28 Peg and 4.50 +/- 0.09 Me and 150 +/- 10 Myr for HD 202240. To compare our abundance determinations with those of stars having similar ages and atmospheric parameters, we select members of open clusters. We notice that our target stars exhibit similar abundance patterns with these members. (C) 2015 Elsevier B.V. All rights reserved.