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An investigation of the stellar association containing the 1.95 day Cepheid SU Cassiopeiae

D. G. Turner, Nancy Remage Evans

Open publisher page 23 citations

Abstract

The results of photometric and spectroscopic observations of SU Cas and the surrounding dust complex are reported. UBV photometry was made of early type stars in the dust complex on eight nights in 1978-79 and a further 10 stars were surveyed within 7 arcmin of SU Cas. Spectroscopic measurements were also made of the objects in order to obtain radial velocities and equivalent widths. The data suggest the region has a moving cluster (BA association) 30 pc in angular extent, with the 1.95 arcday Cepheid SU Cas as a member. The association is 255-261 pc distant and has a 6 pc spread between members. The association stars are around 120 Myr old, typical of 4 solar mass stars. Finally, the core members include visual and spectroscopic binary system and a short-period Cepheid.

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What this paper is about

The results of photometric and spectroscopic observations of SU Cas and the surrounding dust complex are reported. UBV photometry was made of early type stars in the dust complex on eight nights in 1978-79 and a further 10 stars were surveyed within 7 arcmin of SU Cas. Spectroscopic measurements were also made of the objects in order to obtain radial velocities and equivalent widths. The data suggest the region has a moving cluster (BA association) 30 pc in angular extent, with the 1.95 arcday Cepheid SU Cas as a member. The association is 255-261 pc distant and has a 6 pc spread between members. The association stars are around 120 Myr old, typical of 4 solar mass stars. Finally, the core members include visual and spectroscopic binary system and a short-period Cepheid.

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Available abstract

The results of photometric and spectroscopic observations of SU Cas and the surrounding dust complex are reported. UBV photometry was made of early type stars in the dust complex on eight nights in 1978-79 and a further 10 stars were surveyed within 7 arcmin of SU Cas. Spectroscopic measurements were also made of the objects in order to obtain radial velocities and equivalent widths. The data suggest the region has a moving cluster (BA association) 30 pc in angular extent, with the 1.95 arcday Cepheid SU Cas as a member. The association is 255-261 pc distant and has a 6 pc spread between members. The association stars are around 120 Myr old, typical of 4 solar mass stars. Finally, the core members include visual and spectroscopic binary system and a short-period Cepheid.

Key concepts: Physics, Cepheid variable, Astrophysics, Photometry (optics), Stars, Astronomy, Open cluster, Radial velocity

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