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The radial velocity curve and peculiar TiO distribution of the red secondary star in Z Chamaeleontis
Abstract
The secondary star of the dwarf nova Z Cha has been detected with the CCD spectrograph of the CTIO 4 m telescope. The TiO λ7150/λ7650 band ratio implies a Boeshaar spectral type of M5.5 for the secondary star, which contributes ≡15% of the light at λ7500. The absolute absorption strength of TiO is very weak on the side of the star that faces the white dwarf and accretion disk. The authors use cross-correlation techniques to measure the velocity of the secondary star as a function of orbital phase, and examine the photometric variations of spectral features with orbital phase. They also model the phase variations of the absorption features in terms of their surface distribution on the secondary star, evaluate a correction to the observed K velocity to account for the nonuniform line strength, and derive physical parameters of the Z Cha system.
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Cited by
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TYPE Iax SUPERNOVAE: A NEW CLASS OF STELLAR EXPLOSION
Foley, R. J., Challis, P. J., Chornock, R., Ganeshalingam, M., Li, W., Marion, G. H., Morrell, N. I., Pignata, G., Stritzinger, M. D., Silverman, J. M., et al. (2013) · The Astrophysical Journal · doi:10.1088/0004-637x/767/1/57 · Cited by 391
The Distance to SN 1999em in NGC 1637 from the Expanding Photosphere Method
Leonard, D. C., Filippenko, A. V., Gates, E. L., Li, W., Eastman, R. G., Barth, A. J., Bus, S. J., Chornock, R., Coil, A. L., Frink, S., et al. (2002) · Publications of the Astronomical Society of the Pacific · doi:10.1086/324785 · Cited by 328
Stubbs, C. W., High, F. W., George, M. R., DeRose, K. L., Blondin, S., Tonry, J. L., Chambers, K. C., Granett, B. R., Burke, D. L., & Smith, R. C. (2007) · Publications of the Astronomical Society of the Pacific · doi:10.1086/522208 · Cited by 70
Metadata
- Authors
- Wade, R. A., & Horne, K.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1988-01
- Volume
- 324
- Pages
- 411
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1995633101
- Cited by
- 382
- References
- 0
- FWCI
- 0.67
- Type
- journal article
- Language
- en
- Open access
- closed
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- Wade, R. A., & Horne, K. (1988). The radial velocity curve and peculiar TiO distribution of the red secondary star in Z Chamaeleontis. The Astrophysical Journal. https://doi.org/10.1086/165905
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