Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Bartašiūtė S."'
Publikováno v:
Open Astronomy, Vol 22, Iss 4, Pp 273-296 (2013)
We present a new calibration of the seven-color Vilnius system in terms of [Fe/H], applicable to F–M stars in the metallicity range −2.8 ≤[Fe/H]≤ +0.5. We employ a purely empirical approach, based on ~1000 calibrating stars with high-resoluti
Externí odkaz:
https://doaj.org/article/a27b4fa93d9e4b11a64fd8bd2e267dd6
Publikováno v:
Open Astronomy, Vol 21, Iss 3, Pp 387-396 (2012)
We have used the Simbad database and VizieR catalogue access tools to construct the observational color-absolute magnitude diagrams of nearby K-M dwarfs with precise Hipparcos parallaxes (σπ/π ≤ 0:05). Particular attention has been paid to remov
Externí odkaz:
https://doaj.org/article/56f89c509c2a45caa00dd68f794399bd
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 19, Iss 1-2, Pp 63-94 (2010)
CCD photometry in the eight-color Vilnius + I system for 7250 stars down to I =19.6 mag has been obtained in the 20′ × 26′ field of the open cluster IC 361 in Camelopardalis. The catalog of 1420 stars down to V ~ 18.5 mag is presented. It contai
Externí odkaz:
https://doaj.org/article/8b78fcd7702b42daa6dcc6df297065fd
Publikováno v:
Open Astronomy, Vol 12, Iss 4, Pp 547-554 (2003)
Methods used for the quantitative classification of metal-deficient stars in the Vilnius photometric system are reviewed. We present a new calibration of absolute magnitudes for dwarfs and subdwarfs, based on Hipparcos parallaxes. The new classificat
Externí odkaz:
https://doaj.org/article/17aa2d3ef6434b9da5c771f09ca15217
Publikováno v:
Open Astronomy, Vol 12, Iss 4, Pp 539-546 (2003)
Metallicities and distances have been determined from Vilnius photometry for an in situ sample of nearly 650 stars in eight proper-motion fields at high Galactic latitudes. For half of these stars, radial velocities have been measured with the CORAVE
Externí odkaz:
https://doaj.org/article/632e09f70ed7497586b329b19aafa3d0
Publikováno v:
Open Astronomy, Vol 12, Iss 4, Pp 532-538 (2003)
The sensitivity of stellar spectra to C, N, O and α-process element abundances is discussed with the aim of taking this effect into account when selecting a photometric system for the Gaia orbiting observatory. On the basis of a spectrometric, photo
Externí odkaz:
https://doaj.org/article/ab4f54be0f1846588de829e442ea8ce8
Publikováno v:
Open Astronomy, Vol 7, Iss 4, Pp 625-636 (1998)
Externí odkaz:
https://doaj.org/article/6a150e082b3c47b4af2e7edcee5cbd6f
Publikováno v:
Open Astronomy, Vol 7, Iss 4, Pp 589-604 (1998)
Externí odkaz:
https://doaj.org/article/a736149e260e4e54acfea2fd34b8dbcb
Publikováno v:
Open Astronomy, Vol 6, Iss 4, Pp 573-584 (1997)
Externí odkaz:
https://doaj.org/article/6d52f97725c447d2a6b1135d87951daf