Variations in Line Profiles of Atomic Transitions in RR Lyrae Stars
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866911823496740864 |
|---|---|
| author | Sneden, Christopher Preston, George W. |
| author_facet | Sneden, Christopher Preston, George W. |
| contents | We have investigated the absorption shapes of atomic lines and Hα in RR Lyrae stars. We used the database of high resolution spectra gathered with the Las Campanas Observatory du Pont Telescope, analyzing a set of about 2700 short exposure spectra of 17 RRab and 5 RRc variables. To increase the signal-to-noise of the spectra for each star, we first co-added spectra in small photometric phase bins, and then co-added metallic line profiles in velocity space. The resulting line absorption shapes vary with photometric phase in a consistent manner for all RRab stars, while exhibiting no obvious phase-related variations for the RRc stars. We interpret these line profile variations in terms of velocity gradients in the photospheric layers that produce absorption line profiles. The Hα profiles are much broader, indicative of shock temperatures of order 100,000 K. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01420 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Variations in Line Profiles of Atomic Transitions in RR Lyrae Stars Sneden, Christopher Preston, George W. Solar and Stellar Astrophysics Astrophysics of Galaxies We have investigated the absorption shapes of atomic lines and Hα in RR Lyrae stars. We used the database of high resolution spectra gathered with the Las Campanas Observatory du Pont Telescope, analyzing a set of about 2700 short exposure spectra of 17 RRab and 5 RRc variables. To increase the signal-to-noise of the spectra for each star, we first co-added spectra in small photometric phase bins, and then co-added metallic line profiles in velocity space. The resulting line absorption shapes vary with photometric phase in a consistent manner for all RRab stars, while exhibiting no obvious phase-related variations for the RRc stars. We interpret these line profile variations in terms of velocity gradients in the photospheric layers that produce absorption line profiles. The Hα profiles are much broader, indicative of shock temperatures of order 100,000 K. |
| title | Variations in Line Profiles of Atomic Transitions in RR Lyrae Stars |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.01420 |