Zobrazeno 1 - 10
of 12
pro vyhledávání: '"S. A. Naftilan"'
Autor:
S. A. Naftilan, K. Fairchild
Publikováno v:
Publications of the Astronomical Society of the Pacific. 105:565
Eight spectra of the hot flare star, V833 Tau, K5Ve, covering hte region from 3881 A to 8520 A were analyzed using a spectrum synthesis technique. The rapid rotation reported by Vogt, Soderblom, and Penrod (1983) was confirmed. The abundances were es
Publikováno v:
Publications of the Astronomical Society of the Pacific. 104:1045
A spectrum synthesis analysis of eight spectra obtained during the non-flaring state of the cool dMe4 flare star AD Leo, yielded a mild, consistent underabundance, about 0.4 dex with respect to the Sun, for all metals. The turbulence and rotational v
Autor:
E. F. Milone, S. A. Naftilan
Publikováno v:
Symposium - International Astronomical Union. 88:419-422
The three systems differ in period, scale and degree of contact: RW Com is a contact system, RT Lac is semi-detached and CG Cyg is a detached system. Yet they share the properties of a variable asymmetric light curve in the UBV, Ca II H and K emissio
Autor:
E. F. Milone, S. A. Naftilan
Publikováno v:
Close Binary Stars: Observations and Interpretation ISBN: 9789027711175
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8d33f85ef8293e744aac8829d8640416
https://doi.org/10.1007/978-94-009-9038-8_74
https://doi.org/10.1007/978-94-009-9038-8_74
Autor:
G. C. L. Aikman, S. A. Naftilan
The behavior of the Ca II H and K emission lines as seen on 64 high-quality spectra of the RS CVn-type binary star AR Lac is investigated. Evidence is found for rapid (hourly) variability in both the emission strength and line profiles. Although a nu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e488fb65f523c3f9bcb0f4fe55410c26
https://nrc-publications.canada.ca/eng/view/object/?id=19bc4fd7-debc-4158-b479-2db8e21a671d
https://nrc-publications.canada.ca/eng/view/object/?id=19bc4fd7-debc-4158-b479-2db8e21a671d
Autor:
S. A. Naftilan, E. F. Milone
Publikováno v:
Publications of the Astronomical Society of the Pacific. 93:364
The star BD +34 deg 4216 has a composite spectrum. Spectroscopy, photometry, and spectrophotometry of this object show that it is a physical binary consisting of an early-type dwarf and a late-type giant. The variable radial velocity of each componen
Autor:
S. A. Naftilan, E. F. Milone
Publikováno v:
The Astronomical Journal. 90:761
Autor:
S. A. Naftilan
Publikováno v:
The Astrophysical Journal. 206:785
Autor:
S. A. Drake, S. A. Naftilan
Publikováno v:
Publications of the Astronomical Society of the Pacific. 92:675
Two dozen spectrograms of the eclipsing binary RS CVn, taken over the past ten years, are examined. Variable Ca II H and K emission and Balmer-line emission are seen. The variability is examined for correlations with both phase and position of the mi
Autor:
S. A. Naftilan, E. F. Milone
Publikováno v:
The Astronomical Journal. 84:1218
Over four dozen spectra of the close eclipsing system CG Cygni are investigated. This system, studied photometrically by Milone, et al. (1979), exhibits a migrating distortion wave similar to the RS CVn type systems. We find that the Ca II H and K em