The helium content of the blue star near the center of SN 1006

Details The helium content of the blue star near the center of SN 1006 The helium content of the blue star near the center of SN 1006

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98..211s&link_type=abstract

Astronomy and Astrophysics, vol. 98, no. 2, May 1981, p. 211, 212.

Astronomy and Astrophysics

Astrophysics

11

Helium, Hot Stars, Stellar Spectra, Subdwarf Stars, Supernova Remnants, Abundance, Balmer Series, Early Stars, Spectral Line Width

Scientific paper

A determination of the helium content of the faint blue star found near the center of SN 1006 and tentatively associated with the supernova remnant is reported. Analysis of line widths at 90% of the continuum was performed for the H-beta, H-gamma, H-delta and 4471-A (He I) absorption lines of SN 1006, and results were fit to an extensive grid of NLTE model atmospheres and line profiles. A closest fit helium abundance of 0.015 relative to hydrogen is obtained, together with an upper limit effective temperature of 40,000 K, in agreement with that derived from photometry. The effective temperature, helium abundance and implied log surface gravity of 6.5 place the object in the class of subdwarf OB stars, which so far comprises five known objects.

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