Evidence for very nearby hidden white dwarfs
Evidence for very nearby hidden white dwarfs
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附近隐藏着白矮星的证据
DOI:
10.1093/mnras/stw760
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发表时间:
2016
影响因子:
4.8
通讯作者:
Lachaume R.
中科院分区:
文献类型:
--
作者:
Fuhrmann K;Chini R;Kaderhandt L;Chen Z;Lachaume R.
We report the discovery of a tertiary component to the prominent and nearby (d= 14 pc) visual binary α Fornacis. The new invisible component is part of a 4-d short-period Ba-Bb subsystem, whose K-type α For Ba primary shows a striking [Ba/Fe] = +0.26 dex overabundance, at variance with a close to solar [Ba/Fe] = +0.04 dex abundance for its distant visual companion α For A. For the even nearer (d= 8 pc) multiple star ξ Ursae Majoris and its alike 4-d Ba-Bb subsystem, we similarly find [Ba/Fe] = +0.37 dex for its G-type ξ UMa Ba primary, compared to a significantly lower [Ba/Fe] = +0.12 dex for the visual companion ξ UMa A. In both cases, the differential barium enrichment is direct evidence for short-period white dwarf systems and the creation of blue straggler stars through mass transfer and wind accretion, for their close and distant companions, respectively. These findings also imply that conventional stellar age datings for both α For and ξ UMa are likely not reliable.
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DOI:
10.1088/0004-637x/785/1/68
发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
作者:
K. Fuhrmann;R. Chini;L. Buda;F. Pozo Nuñez
通讯作者:
F. Pozo Nuñez
影响因子:
4.8
作者:
J. Holberg;T. Oswalt;E. Sion;M. Barstow;M. Burleigh
通讯作者:
J. Holberg;T. Oswalt;E. Sion;M. Barstow;M. Burleigh
DOI:
10.1086/316797
发表时间:
1997
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
N. Hambly;S. Smartt;S. Hodgkin
通讯作者:
S. Hodgkin
影响因子:
4.8
作者:
R. Jeffries;I. Stevens
通讯作者:
I. Stevens
DOI:
10.1088/0004-6256/147/6/129
发表时间:
2014-01
期刊:
The Astronomical Journal
影响因子:
--
作者:
E. Sion;J. Holberg;T. Oswalt;G. Mccook;R. Wasatonic;Janine Myszka
通讯作者:
E. Sion;J. Holberg;T. Oswalt;G. Mccook;R. Wasatonic;Janine Myszka