Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs
We have used the 2MASS all-sky survey and WISE to look for ultracool dwarfs that are part of multiple systems containing main sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. We consider the binary fraction for L dwarfs an...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2013-04-01
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| Series: | EPJ Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/epjconf/20134706002 |
| _version_ | 1818950449140596736 |
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| author | Pinfield D.J. Gomes J.I. |
| author_facet | Pinfield D.J. Gomes J.I. |
| author_sort | Pinfield D.J. |
| collection | DOAJ |
| description | We have used the 2MASS all-sky survey and WISE to look for ultracool dwarfs that are part of multiple systems containing main sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. We consider the binary fraction for L dwarfs and main sequence stars, and further assess possible unresolved multiplicity within the full companion sample. This analysis shows that some of the L dwarfs in this sample might actually be unresolved binaries themselves. We have also identified a sample of common proper motion systems in which a main sequence star has a white dwarf as wide companion. These systems can help explore key issues in star evolution theory, as the initial-final mass relationship of white dwarfs, or the chromospheric activity-age relationship for stars still in the main sequence. Spectroscopy for 50 white dwarf candidates, selected from the SuperCOSMOS Science Archive, was obtained. We have also observed 6 of the main sequence star companions, and have estimated their effective temperatures, rotational and microturbulent velocities and metallicities. |
| first_indexed | 2024-12-20T09:18:46Z |
| format | Article |
| id | doaj.art-3bff9fcc206144318ea7453c4cd07017 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-20T09:18:46Z |
| publishDate | 2013-04-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-3bff9fcc206144318ea7453c4cd070172022-12-21T19:45:21ZengEDP SciencesEPJ Web of Conferences2100-014X2013-04-01470600210.1051/epjconf/20134706002Searching for benchmark systems containing ultra-cool dwarfs and white dwarfsPinfield D.J.Gomes J.I.We have used the 2MASS all-sky survey and WISE to look for ultracool dwarfs that are part of multiple systems containing main sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. We consider the binary fraction for L dwarfs and main sequence stars, and further assess possible unresolved multiplicity within the full companion sample. This analysis shows that some of the L dwarfs in this sample might actually be unresolved binaries themselves. We have also identified a sample of common proper motion systems in which a main sequence star has a white dwarf as wide companion. These systems can help explore key issues in star evolution theory, as the initial-final mass relationship of white dwarfs, or the chromospheric activity-age relationship for stars still in the main sequence. Spectroscopy for 50 white dwarf candidates, selected from the SuperCOSMOS Science Archive, was obtained. We have also observed 6 of the main sequence star companions, and have estimated their effective temperatures, rotational and microturbulent velocities and metallicities.http://dx.doi.org/10.1051/epjconf/20134706002 |
| spellingShingle | Pinfield D.J. Gomes J.I. Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs EPJ Web of Conferences |
| title | Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs |
| title_full | Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs |
| title_fullStr | Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs |
| title_full_unstemmed | Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs |
| title_short | Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs |
| title_sort | searching for benchmark systems containing ultra cool dwarfs and white dwarfs |
| url | http://dx.doi.org/10.1051/epjconf/20134706002 |
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