A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 cm LINE OBSERVATIONS
We present the results of a search for H i 21 cm line emission from the circumstellar environments of four Galactic Cepheids (RS Pup, X Cyg, ζ Gem, and T Mon) based on observations with the Karl G. Jansky Very Large Array. The observations were aimed at detecting gas associated with previous or ongo...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/108110 |
| _version_ | 1826202166826631168 |
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| author | Marengo, M. Evans, N. R. Matthews, Lynn D. |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Marengo, M. Evans, N. R. Matthews, Lynn D. |
| author_sort | Marengo, M. |
| collection | MIT |
| description | We present the results of a search for H i 21 cm line emission from the circumstellar environments of four Galactic Cepheids (RS Pup, X Cyg, ζ Gem, and T Mon) based on observations with the Karl G. Jansky Very Large Array. The observations were aimed at detecting gas associated with previous or ongoing mass loss. Near the long-period Cepheid T Mon, we report the detection of a partial shell-like structure whose properties appear consistent with originating from an earlier epoch of Cepheid mass loss. At the distance of T Mon, the nebula would have a mass (H I+He) of ∼0.5M[subscript ⨀], or ~6% of the stellar mass. Assuming that one-third of the nebular mass comprises swept-up interstellar gas, we estimate an implied mass-loss rate of [superscript dot]M∼(0.6-2) x 10⁻⁵ M[subscript ⨀] yr−1. No clear signatures of circumstellar emission were found toward ζ Gem, RS Pup, or X Cyg, although in each case, line-of-sight confusion compromised portions of the spectral band. For the undetected stars, we derive model-dependent 3𝜎 upper limits on the mass-loss rates, averaged over their lifetimes on the instability strip, of ≲ (0.3-6) x 10⁻⁶ M[subscript ⨀] yr⁻¹ and estimate the total amount of mass lost to be less than a few percent of the stellar mass. |
| first_indexed | 2024-09-23T12:03:34Z |
| format | Article |
| id | mit-1721.1/108110 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:03:34Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
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| spelling | mit-1721.1/1081102022-09-27T23:47:36Z A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 cm LINE OBSERVATIONS Marengo, M. Evans, N. R. Matthews, Lynn D. Haystack Observatory Matthews, Lynn D. We present the results of a search for H i 21 cm line emission from the circumstellar environments of four Galactic Cepheids (RS Pup, X Cyg, ζ Gem, and T Mon) based on observations with the Karl G. Jansky Very Large Array. The observations were aimed at detecting gas associated with previous or ongoing mass loss. Near the long-period Cepheid T Mon, we report the detection of a partial shell-like structure whose properties appear consistent with originating from an earlier epoch of Cepheid mass loss. At the distance of T Mon, the nebula would have a mass (H I+He) of ∼0.5M[subscript ⨀], or ~6% of the stellar mass. Assuming that one-third of the nebular mass comprises swept-up interstellar gas, we estimate an implied mass-loss rate of [superscript dot]M∼(0.6-2) x 10⁻⁵ M[subscript ⨀] yr−1. No clear signatures of circumstellar emission were found toward ζ Gem, RS Pup, or X Cyg, although in each case, line-of-sight confusion compromised portions of the spectral band. For the undetected stars, we derive model-dependent 3𝜎 upper limits on the mass-loss rates, averaged over their lifetimes on the instability strip, of ≲ (0.3-6) x 10⁻⁶ M[subscript ⨀] yr⁻¹ and estimate the total amount of mass lost to be less than a few percent of the stellar mass. National Science Foundation (U.S.) (AST-1310930) Chandra X-ray Center (U.S.) (NAS8-03060) 2017-04-13T16:28:40Z 2017-04-13T16:28:40Z 2016-12 2016-09 Article http://purl.org/eprint/type/JournalArticle 1538-3881 0004-6256 http://hdl.handle.net/1721.1/108110 Matthews, L. D., M. Marengo, and N. R. Evans. “A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 Cm LINE OBSERVATIONS.” The Astronomical Journal 152, no. 6 (December 2, 2016): 200. © 2016 The American Astronomical Society. en_US http://dx.doi.org/10.3847/0004-6256/152/6/200 Astronomical 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 | Marengo, M. Evans, N. R. Matthews, Lynn D. A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 cm LINE OBSERVATIONS |
| title | A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 cm LINE OBSERVATIONS |
| title_full | A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 cm LINE OBSERVATIONS |
| title_fullStr | A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 cm LINE OBSERVATIONS |
| title_full_unstemmed | A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 cm LINE OBSERVATIONS |
| title_short | A SEARCH FOR MASS LOSS ON THE CEPHEID INSTABILITY STRIP USING H i 21 cm LINE OBSERVATIONS |
| title_sort | search for mass loss on the cepheid instability strip using h i 21 cm line observations |
| url | http://hdl.handle.net/1721.1/108110 |
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