Entropy & equation of state (EOS) for hot bare strange stars

Citation
S. Ray et al., Entropy & equation of state (EOS) for hot bare strange stars, ASTRON ASTR, 364(2), 2000, pp. L89-L92
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
364
Issue
2
Year of publication
2000
Pages
L89 - L92
Database
ISI
SICI code
0004-6361(200012)364:2<L89:E&EOS(>2.0.ZU;2-7
Abstract
Compactness of some stars is explained if they are strange stars (SS) as sh own by Dey et al. (1998) (D98) and Li et al. (1999a). One of these compact star candidates is the SAX J1808.4-3658 (SAX in short) believed to be an im portant link in the genesis of radio pulsars. SS have also been suggested f or bursting X-ray pulsars (GRO J1744-28, Cheng et al. 1998), from quasi-per iodic oscillations (QPO) of X-ray binaries (4U 1728-34, Li et al. 1999b) an d from peculiarity of proper ties of radio pulsars (PSR 0943 + 10, Xu et al .1999; Kapoor et al. 2000). We now extend the calculation to include high t emperatures upto T = 70 MeV similar to 8 x 10(11) K-o and find that the nat ure of the mass (M) and radius (R), derived from astrophysical data, is sti ll retained. The entropy is calculated and matches onto that calculated fro m hadronic models thus supporting the idea that the quark-hadron transition may be continuous.