A lithium depletion boundary age of 21 Myr for the Beta Pictoris moving group
Optical spectroscopy is used to confirm membership for eight low-mass candidates in the young Beta Pic moving group (BPMG) via their radial velocities, chromospheric activity and kinematic parallaxes. We searched for the presence of the Li i 6708 Å resonance feature and combined the results with lit...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society. Letters 2014-02, Vol.438 (1), p.L11-L15 |
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| container_title | Monthly notices of the Royal Astronomical Society. Letters |
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| creator | Binks, A. S. Jeffries, R. D. |
| description | Optical spectroscopy is used to confirm membership for eight low-mass candidates in the young Beta Pic moving group (BPMG) via their radial velocities, chromospheric activity and kinematic parallaxes. We searched for the presence of the Li i 6708 Å resonance feature and combined the results with literature measurements of other BPMG members to find the age-dependent lithium depletion boundary (LDB) - the luminosity at which Li remains unburned in a coeval group. The LDB age of the BPMG is 21 ± 4 Myr and insensitive to the choice of low-mass evolutionary models. This age is more precise, likely to be more accurate, and much older than that commonly assumed for the BPMG. As a result, substellar and planetary companions of BPMG members will be more massive than previously thought. |
| doi_str_mv | 10.1093/mnrasl/slt141 |
| format | Article |
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D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A lithium depletion boundary age of 21 Myr for the Beta Pictoris moving group</atitle><jtitle>Monthly notices of the Royal Astronomical Society. Letters</jtitle><stitle>Mon. Not. R. Astron. Soc: Lett</stitle><date>2014-02-01</date><risdate>2014</risdate><volume>438</volume><issue>1</issue><spage>L11</spage><epage>L15</epage><pages>L11-L15</pages><issn>1745-3925</issn><eissn>1745-3933</eissn><abstract>Optical spectroscopy is used to confirm membership for eight low-mass candidates in the young Beta Pic moving group (BPMG) via their radial velocities, chromospheric activity and kinematic parallaxes. We searched for the presence of the Li i 6708 Å resonance feature and combined the results with literature measurements of other BPMG members to find the age-dependent lithium depletion boundary (LDB) - the luminosity at which Li remains unburned in a coeval group. The LDB age of the BPMG is 21 ± 4 Myr and insensitive to the choice of low-mass evolutionary models. This age is more precise, likely to be more accurate, and much older than that commonly assumed for the BPMG. As a result, substellar and planetary companions of BPMG members will be more massive than previously thought.</abstract><pub>Oxford University Press</pub><doi>10.1093/mnrasl/slt141</doi><oa>free_for_read</oa></addata></record> |
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| title | A lithium depletion boundary age of 21 Myr for the Beta Pictoris moving group |
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