THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED
From high resolution (R sime 45,000), high signal-to-noise ratio (S/N > 400) spectra gathered with the Immersion Grating Infrared Spectrograph (IGRINS) in the H and K photometric bands, we have derived elemental abundances of two bright, well-known metal-poor halo stars: the red giant HD 122563 a...
| Main Authors: | , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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IOP Publishing
2016
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| Online Access: | http://hdl.handle.net/1721.1/102639 https://orcid.org/0000-0002-2139-7145 |
| _version_ | 1811091653307400192 |
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| author | Sneden, Christopher Kim, Hwihyun Mace, Gregory N. Kaplan, Kyle F. Lee, Hye-In Oh, Heeyoung Oh, Jae Sok Pak, Soojong Park, Chan Pavel, Michael D. Yuk, In-Soo Jaffe, Daniel T. Afsar, Melike Frebel, Anna L. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Sneden, Christopher Kim, Hwihyun Mace, Gregory N. Kaplan, Kyle F. Lee, Hye-In Oh, Heeyoung Oh, Jae Sok Pak, Soojong Park, Chan Pavel, Michael D. Yuk, In-Soo Jaffe, Daniel T. Afsar, Melike Frebel, Anna L. |
| author_sort | Sneden, Christopher |
| collection | MIT |
| description | From high resolution (R sime 45,000), high signal-to-noise ratio (S/N > 400) spectra gathered with the Immersion Grating Infrared Spectrograph (IGRINS) in the H and K photometric bands, we have derived elemental abundances of two bright, well-known metal-poor halo stars: the red giant HD 122563 and the subgiant HD 140283. Since these stars have metallicities approaching [Fe/H] = −3, their absorption features are generally very weak. Neutral-species lines of Mg, Si, S and Ca are detectable, as well as those of the light odd-Z elements Na and Al. The derived IR-based abundances agree with those obtained from optical-wavelength spectra. For Mg and Si the abundances from the infrared transitions are improvements to those derived from shorter wavelength data. Many useful OH and CO lines can be detected in the IGRINS HD 122563 spectrum, from which derived O and C abundances are consistent to those obtained from the traditional [O i] and CH features. IGRINS high resolutions H- and K-band spectroscopy offers promising ways to determine more reliable abundances for additional metal-poor stars whose optical features are either not detectable, or too weak, or are based on lines with analytical difficulties. |
| first_indexed | 2024-09-23T15:05:48Z |
| format | Article |
| id | mit-1721.1/102639 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:05:48Z |
| publishDate | 2016 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1026392022-10-02T00:35:29Z THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED Sneden, Christopher Kim, Hwihyun Mace, Gregory N. Kaplan, Kyle F. Lee, Hye-In Oh, Heeyoung Oh, Jae Sok Pak, Soojong Park, Chan Pavel, Michael D. Yuk, In-Soo Jaffe, Daniel T. Afsar, Melike Frebel, Anna L. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Frebel, Anna L. From high resolution (R sime 45,000), high signal-to-noise ratio (S/N > 400) spectra gathered with the Immersion Grating Infrared Spectrograph (IGRINS) in the H and K photometric bands, we have derived elemental abundances of two bright, well-known metal-poor halo stars: the red giant HD 122563 and the subgiant HD 140283. Since these stars have metallicities approaching [Fe/H] = −3, their absorption features are generally very weak. Neutral-species lines of Mg, Si, S and Ca are detectable, as well as those of the light odd-Z elements Na and Al. The derived IR-based abundances agree with those obtained from optical-wavelength spectra. For Mg and Si the abundances from the infrared transitions are improvements to those derived from shorter wavelength data. Many useful OH and CO lines can be detected in the IGRINS HD 122563 spectrum, from which derived O and C abundances are consistent to those obtained from the traditional [O i] and CH features. IGRINS high resolutions H- and K-band spectroscopy offers promising ways to determine more reliable abundances for additional metal-poor stars whose optical features are either not detectable, or too weak, or are based on lines with analytical difficulties. National Science Foundation (U.S.) (CAREER Grant AST-1255160) 2016-05-23T23:08:16Z 2016-05-23T23:08:16Z 2016-03 2015-10 Article http://purl.org/eprint/type/JournalArticle 1538-4357 0004-637X http://hdl.handle.net/1721.1/102639 Afşar, Melike, Christopher Sneden, Anna Frebel, Hwihyun Kim, Gregory N. Mace, Kyle F. Kaplan, Hye-In Lee, et al. “THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED.” The Astrophysical Journal 819, no. 2 (March 3, 2016): 103. © 2016 The American Astronomical Society https://orcid.org/0000-0002-2139-7145 en_US http://dx.doi.org/10.3847/0004-637x/819/2/103 The Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Sneden, Christopher Kim, Hwihyun Mace, Gregory N. Kaplan, Kyle F. Lee, Hye-In Oh, Heeyoung Oh, Jae Sok Pak, Soojong Park, Chan Pavel, Michael D. Yuk, In-Soo Jaffe, Daniel T. Afsar, Melike Frebel, Anna L. THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED |
| title | THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED |
| title_full | THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED |
| title_fullStr | THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED |
| title_full_unstemmed | THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED |
| title_short | THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED |
| title_sort | chemical compositions of very metal poor stars hd 122563 and hd 140283 a view from the infrared |
| url | http://hdl.handle.net/1721.1/102639 https://orcid.org/0000-0002-2139-7145 |
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