Expanding envelope of DQ Herculis

Details Expanding envelope of DQ Herculis Expanding envelope of DQ Herculis

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aca....42...17h&link_type=abstract

Acta Astronomica (ISSN 0001-5237), vol. 42, no. 1, 1992, p. 17-28.

Astronomy and Astrophysics

Astronomy

11

Eclipsing Binary Stars, H Alpha Line, Novae, Stellar Envelopes, Stellar Evolution, Stellar Magnitude, Stellar Spectrophotometry, Stellar Structure, Velocity Distribution

Scientific paper

Spectrograms in the H-alpha line, taken at eight position angles of the slit, have been measured to determine velocities in the expanding shell around Nova DQ Her 1934. The observed velocities can be represented with a model involving a prolate, axially symmetric ellipsoidal shell with the following equatorial and polar radii and expansion velocities: a = 6.27 +/- 0.16 deg, b = 8.61 +/- 0.16 deg, V(E) = 384 +/- 21 km/s and V(P) = 528 +/- 25 km/s. The polar axis of the shell is nearly perpendicular to the line of sight (i = 88.5 +/- 0.7. A major deviation from this model occurs in the narrow equatorial belt, where the expansion velocity is only V(EB) = 351 +/- 3 km/s. This correlates with the observed shape of the shell which shows a few percent narrowing near the equator. The distance is d = 561 +/- 19 pc (i.e., larger than estimated earlier).

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