Zobrazeno 1 - 10
of 137
pro vyhledávání: '"R. F. Griffin"'
Publikováno v:
Odessa Astronomical Publications, Vol 23, Iss 0, Pp 86-89 (2010)
SRC variables are M supergiants, precursors to Type II supernovae, that vary in brightness with moderately regular periods of order 100–1000 days. Although identified as pulsating stars that obey their own period-luminosity relation, few have been
Externí odkaz:
https://doaj.org/article/89ea977866e44647bee8733b6e6282f9
Autor:
R. E. M. Griffin, R. F. Griffin
Publikováno v:
Astronomische Nachrichten. 339:586-595
Autor:
R. F. Griffin, R. E. M. Griffin
Publikováno v:
Astronomische Nachrichten. 338:604-613
We separate the component spectra of the composite-spectrum binary 14 Serpentis, derive a precise double-lined (SB2) orbit for the system, and investigate the physical properties and evolutionary states of its component stars. The 260-day binary is c
Radial-velocity observations made on more than a thousand nights are presented for the type star of the R Coronae Borealis (RCB) class. There are four principal sources: the Lick Observatory (1950-1953), the original Cambridge radial-velocity spectro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::343c5f2e223c67493bcf75c822ddd076
http://arxiv.org/abs/1810.10823
http://arxiv.org/abs/1810.10823
Autor:
R. F. Griffin, R. E. M. Griffin
Publikováno v:
Astronomische Nachrichten. 336:178-188
From accurate radial-velocity measurements covering 11 circuits of the orbit of the composite-spectrum binary 45 Cnc, together with high-resolution spectroscopy spanning nearly 3 circuits, we have (i) isolated cleanly the spectrum of the early-type s
The orbit of the visual-speckle binary A 2801 (HD 26441) was calculated independently of the previously published double-lined spectroscopic solution, obtaining similar values for the common orbital elements. In this way, it has been possible to prov
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29f699b4ff978dcc3743a765fee71d5d
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 444:3641-3646
We report a comprehensive study of the binary system COU 2031, based on simultaneous and independent astrometric visual and speckle observations and on radial-velocity measurements. The similarity of the two orbital solutions allows us to obtain not
Autor:
R. F. Griffin
Publikováno v:
Journal of Astrophysics and Astronomy. 33:227-244
The ‘Redman K stars’ project, described more particularly in the paper immediately following this one, involved the repeated measurement on a quasi-annual basis of the radial velocities of a group of 86 seventh-magnitude late-type stars over an i
Autor:
R. F. Griffin, A. Stroe
Publikováno v:
Journal of Astrophysics and Astronomy. 33:245-278
The ‘Redman K stars’ are a group of 80-odd seventh-magnitude late-type stars, nearly all giants, distributed along the Galactic equator between approximate longitudes 50° and 150° (roughly Sagitta to Cassiopeia). Their radial velocities have be
Autor:
R. F. Griffin
Publikováno v:
Journal of Astrophysics and Astronomy. 33:29-200
Spectroscopic orbits are presented for 52 stars in the Hyades field, of which 41 prove to be actual members of the Hyades (with some reservations in two cases). Most of the stars concerned have not had orbits published for them previously. Three of t