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  On the Chemical Abundances of Miras in Clusters: V1 in the Metal-rich Globular NGC 5927

D'Orazi, V., Magurno, D., Bono, G., Matsunaga, N., Braga, V. F., Elgueta, S. S., et al. (2018). On the Chemical Abundances of Miras in Clusters: V1 in the Metal-rich Globular NGC 5927. Astrophysical Journal, Letters, 855(1): L9. doi:10.3847/2041-8213/aab100.

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D'Orazi, V., Author
Magurno, D., Author
Bono, G., Author
Matsunaga, N., Author
Braga, V. F., Author
Elgueta, S. S., Author
Fukue, K., Author
Hamano, S., Author
Inno, L., Author
Kobayashi, N., Author
Kondo, S., Author
Monelli, M., Author
Nonino, M., Author
Przybilla, N., Author
Sameshima, H., Author
Saviane, I., Author
Taniguchi, D., Author
Thevenin, F., Author
Urbaneja-Perez, M., Author
Watase, A., Author
Arai, A., AuthorBergemann, M., AuthorBuonanno, R., AuthorDall'Ora, M., AuthorSilva, R. Da, AuthorFabrizio, M., AuthorFerraro, I., AuthorFiorentino, G., AuthorFrancois, P., AuthorGilmozzi, R., AuthorIannicola, G., AuthorIkeda, Y., AuthorJian, M., AuthorKawakita, H., AuthorKudritzki, R. P., AuthorLemasle, B., AuthorMarengo, M., AuthorMarinoni, S., AuthorMartínez-Vázquez, C. E., AuthorMinniti, D., AuthorNeeley, J., AuthorOtsubo, S., AuthorPrieto, J. L., AuthorProxauf, Bastian1, Author              Romaniello, M., AuthorSanna, N., AuthorSneden, C., AuthorTakenaka, K., AuthorTsujimoto, T., AuthorValenti, E., AuthorYasui, C., AuthorYoshikawa, T., AuthorZoccali, M., Author more..
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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Free keywords: globular clusters: individual (NGC 5927) ; stars: abundances; stars: variables: general
 Abstract: We present the first spectroscopic abundance determination of iron, α-elements (Si, Ca, and Ti), and sodium for the Mira variable V1 in the metal-rich globular cluster NGC 5927. We use high-resolution (R ~ 28,000), high signal-to-noise ratio (~200) spectra collected with WINERED, a near-infrared (NIR) spectrograph covering simultaneously the wavelength range 0.91–1.35 μm. The effective temperature and the surface gravity at the pulsation phase of the spectroscopic observation were estimated using both optical (V) and NIR time-series photometric data. We found that the Mira is metal-rich ([Fe/H] = −0.55 ± 0.15) and moderately α-enhanced ([α/Fe] = 0.15 ± 0.01, σ = 0.2). These values agree quite well with the mean cluster abundances based on high-resolution optical spectra of several cluster red giants available in the literature ([Fe/H] = − 0.47 ± 0.06, [α/Fe] = + 0.24 ± 0.05). We also found a Na abundance of +0.35 ± 0.20 that is higher than the mean cluster abundance based on optical spectra (+0.18 ± 0.13). However, the lack of similar spectra for cluster red giants and that of corrections for departures from local thermodynamical equilibrium prevents us from establishing whether the difference is intrinsic or connected with multiple populations. These findings indicate a strong similarity between optical and NIR metallicity scales in spite of the difference in the experimental equipment, data analysis, and in the adopted spectroscopic diagnostics.

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Language(s): eng - English
 Dates: 2018-12-272018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/2041-8213/aab100
 Degree: -

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Title: Astrophysical Journal, Letters
  Other : ApJL
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 855 (1) Sequence Number: L9 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_1