Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Philip A. G. Davis"'
Publikováno v:
Open Astronomy, Vol 20, Iss 1, Pp 27-52 (2011)
We have performed multicolor CCD observations of the central area of NGC 752 to search for faint, low-mass members of this open cluster. Four 12’ x 12’ fields were taken on the 1.8 m Vatican Advanced Technology Telescope (Mt. Graham, Arizona) usi
Externí odkaz:
https://doaj.org/article/6192a7f29ae842609ee327fab8629d86
Publikováno v:
Open Astronomy, Vol 12, Iss 4, Pp 476-483 (2003)
The importance of determining the error of the flat field in CCD photometry is detailed and our methods of doing this are described. We now have reached a precision of 1-1.5 % in our photometry. Color-magnitude diagrams of the open cluster M67 (ours
Externí odkaz:
https://doaj.org/article/3130767c2c4e47d29a06f100546044c1
Publikováno v:
Open Astronomy, Vol 12, Iss 4, Pp 497-502 (2003)
The accuracy of new CCD photometry in the Vilnius system of the M67 cluster is analyzed. The observational material is obtained during six observing runs in 1994-2001 with the 1 meter telescope of the USNO Flagstaff Station. The main task was to esta
Externí odkaz:
https://doaj.org/article/71d33dbe91394d61ac63cd9756964701
Publikováno v:
Open Astronomy, Vol 12, Iss 4, Pp 471-476 (2003)
CCD photometry of standard areas of the seven-color Strömvil photometric system in some open and globular clusters is described. The primary standards are being measured with a two-channel photoelectric photometer on the 1.5 meter telescope on Mt. L
Externí odkaz:
https://doaj.org/article/96b880a1e5644aeab9db84e80dfcd988
Publikováno v:
Open Astronomy, Vol 12, Iss 4, Pp 484-490 (2003)
We briefly describe a method of organizing all the star field exposures taken in a complete CCD observational run. By a “CommandLog” (to be published in J. Astron. Data) one can organize all the observations and process them within IRAF in an ord
Externí odkaz:
https://doaj.org/article/b12ac6436c4842329ce4e905540f5ef5
Autor:
Kazlauskas A., Straižys V., Boyle R. P., Philip A. G. Davis, Laugalys V., Černis K., Sperauskas J.
Publikováno v:
Open Astronomy, Vol 12, Iss 4, Pp 491-496 (2003)
A calibration of color indices of the Strömvil photometric system in terms of physical parameters of stars is presented. The calibration is based on photoelectric photometry of about 1000 stars with known effective temperatures, distances, gravities
Externí odkaz:
https://doaj.org/article/e08533ea39d04b928ae156dede454237
Autor:
Straižys V., Kazlauskas A., Černiauskas A., Boyle R. P., Vrba F. J., Philip A. G. Davis, Laugalys V., Černis K., Smriglio F.
Publikováno v:
Open Astronomy, Vol 12, Iss 3, Pp 323-351 (2003)
Seven-color photometry in the Vilnius system has been obtained for 420 stars down to V = 16 mag in the area containing the overlapping open clusters NGC 1750 and NGC 1758 in Taurus. Spectral and luminosity classes, color excesses, interstellar extinc
Externí odkaz:
https://doaj.org/article/767df5bf0dd74d90a187b9d1727ec54e
Autor:
Philip A. G. Davis
Publikováno v:
Open Astronomy, Vol 6, Iss 1, Pp 63-70 (1997)
Externí odkaz:
https://doaj.org/article/7655c2fcef5743a59268b9f637499b93
Publikováno v:
Open Astronomy, Vol 5, Iss 1, Pp 83-102 (1996)
Externí odkaz:
https://doaj.org/article/a93a895bacc94b358bb3f675417bc6b1
Autor:
Adelman Saul J., Philip A. G. Davis
Publikováno v:
Open Astronomy, Vol 5, Iss 1, Pp 117-124 (1996)
Externí odkaz:
https://doaj.org/article/d7309f74c8a443d980cdf118d7f4d8c1