Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae
We report the discovery of the likely white dwarf companions to radio millisecond pulsars 47 Tuc Q and 47 Tuc S in the globular cluster 47 Tucanae. These blue stars were found in near-ultraviolet images from the <i>Hubble Space Telescope</i> for which we derived accurate absolute astrome...
Guardado en:
| Autores principales: | , , , , , , , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2015
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/93592 http://mnras.oxfordjournals.org/content/453/3/2707 https://ri.conicet.gov.ar/handle/11336/10870 |
| Aporte de: |
| id |
I19-R120-10915-93592 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Astronomía pulsars: individual: PSR J0024−7204Q pulsars: individual: PSR J0024−7204S pulsars: individual: PSR J0024−7204T pulsars: individual: PSR J0024−7203U pulsars: individual: PSR J0024−7204Y globular clusters: individual: 47 Tucanae |
| spellingShingle |
Astronomía pulsars: individual: PSR J0024−7204Q pulsars: individual: PSR J0024−7204S pulsars: individual: PSR J0024−7204T pulsars: individual: PSR J0024−7203U pulsars: individual: PSR J0024−7204Y globular clusters: individual: 47 Tucanae Rivera Sandoval, L. E. Berg, M. van den Heinke, C. O. Cohn, H. N Lugger, P. M Freire, P. Anderson, J. Serenelli, A. M. Althaus, Leandro Gabriel Cool, A. M. Grindlay, J. E. Edmonds, P. D. Wijnands, R. Ivanova, N. Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae |
| topic_facet |
Astronomía pulsars: individual: PSR J0024−7204Q pulsars: individual: PSR J0024−7204S pulsars: individual: PSR J0024−7204T pulsars: individual: PSR J0024−7203U pulsars: individual: PSR J0024−7204Y globular clusters: individual: 47 Tucanae |
| description |
We report the discovery of the likely white dwarf companions to radio millisecond pulsars 47 Tuc Q and 47 Tuc S in the globular cluster 47 Tucanae. These blue stars were found in near-ultraviolet images from the <i>Hubble Space Telescope</i> for which we derived accurate absolute astrometry, and are located at positions consistent with the radio coordinates to within 0.016 arcsec (0.2σ). We present near-ultraviolet and optical colours for the previously identified companion to millisecond pulsar 47 Tuc U, and we unambiguously confirm the tentative prior identifications of the optical counterparts to 47 Tuc T and 47 Tuc Y. For the latter, we present its radio-timing solution for the first time. We find that all five near-ultraviolet counterparts have U<sub>300</sub> − B<sub>390</sub> colours that are consistent with He white dwarf cooling models for masses ∼0.16–0.3 M⊙ and cooling ages within ∼0.1–6 Gyr. The Hα − R<sub>625</sub> colours of 47 Tuc U and 47 Tuc T indicate the presence of a strong Hα absorption line, as expected for white dwarfs with an H envelope. |
| format |
Articulo Articulo |
| author |
Rivera Sandoval, L. E. Berg, M. van den Heinke, C. O. Cohn, H. N Lugger, P. M Freire, P. Anderson, J. Serenelli, A. M. Althaus, Leandro Gabriel Cool, A. M. Grindlay, J. E. Edmonds, P. D. Wijnands, R. Ivanova, N. |
| author_facet |
Rivera Sandoval, L. E. Berg, M. van den Heinke, C. O. Cohn, H. N Lugger, P. M Freire, P. Anderson, J. Serenelli, A. M. Althaus, Leandro Gabriel Cool, A. M. Grindlay, J. E. Edmonds, P. D. Wijnands, R. Ivanova, N. |
| author_sort |
Rivera Sandoval, L. E. |
| title |
Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae |
| title_short |
Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae |
| title_full |
Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae |
| title_fullStr |
Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae |
| title_full_unstemmed |
Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae |
| title_sort |
discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 tucanae |
| publishDate |
2015 |
| url |
http://sedici.unlp.edu.ar/handle/10915/93592 http://mnras.oxfordjournals.org/content/453/3/2707 https://ri.conicet.gov.ar/handle/11336/10870 |
| work_keys_str_mv |
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Repositorios |
| _version_ |
1764820491417157632 |