Zobrazeno 1 - 10
of 75
pro vyhledávání: '"H. Jahreiß"'
AIMS: With our low-resolution spectroscopic observing program for selected blue proper motion stars, we tried to find new white dwarfs (WDs) in the solar neighbourhood. METHODS: We used the LSPM catalogue with a lower proper motion limit of 150mas/yr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d01a099396bab374fa1760c8b9dacc27
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 451:149-158
A new sample of stars, representative of the solar neighbourhood luminosity function, is constructed from the Hipparcos catalogue and the Fifth Catalogue of Nearby Stars. We have cross-matched to sources in the 2MASS catalogue so that for all stars i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b2511f77b558433affd410975c000053
https://doi.org/10.1093/mnras/stv858
https://doi.org/10.1093/mnras/stv858
Publikováno v:
Astronomy & Astrophysics. 613:A26
Using an accurate Gaia TGAS 25pc sample, nearly complete for GK stars, and selecting common proper motion (CPM) candidates from UCAC5, we search for new white dwarf (WD) companions around nearby stars with relatively small proper motions. For investi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc123dbb722c71cf5c08269f3319e377
https://doi.org/10.1051/0004-6361/201731753
https://doi.org/10.1051/0004-6361/201731753
Autor:
Andreas Just, H. Jahreiß
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 402:461-478
We present a fully consistent evolutionary disc model of the solar cylinder. The model is based on a sequence of stellar subpopulations described by the star formation history (SFR) and the dynamical heating law [given by the age-velocity dispersion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::225bdbe29ca63bce442ce45195290c2e
https://doi.org/10.1111/j.1365-2966.2009.15893.x
https://doi.org/10.1111/j.1365-2966.2009.15893.x
Autor:
H. Jahreiss, Andreas Just
Publikováno v:
Astronomische Nachrichten. 329:790-800
For an understanding of Galactic stellar populations in the SDSS filter system well defined stellar samples are needed. The nearby stars provide a complete stellar sample representative for the thin disc population. We compare the filter transformati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35e21bcf2a0afced23eaa25e356c72e1
https://doi.org/10.1002/asna.200811030
https://doi.org/10.1002/asna.200811030
Publikováno v:
Astronomy & Astrophysics. 484:575-579
28 hitherto neglected candidates for the Catalogue of Nearby Stars (CNS) were investigated to verify their classification and to improve their distance estimates. All targets had at least a preliminary status of being nearby dwarf stars based on thei
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d2850ae1abd949a2a04a52421b0846ee
https://doi.org/10.1051/0004-6361:200809471
https://doi.org/10.1051/0004-6361:200809471
Publikováno v:
Astronomy & Astrophysics. 464:787-791
Aims. Candidates with suspect distances from the Catalog of Nearby Stars were included in the Torino Observatory Parallax Program with the goal to clarify their membership in that catalog. Methods. Observations of the objects were made over the perio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f4cb3c00babd27d164f6f615241ff60f
https://doi.org/10.1051/0004-6361:20066408
https://doi.org/10.1051/0004-6361:20066408
Publikováno v:
Astronomy & Astrophysics. 433:911-916
We present an analysis of the space motions of 742 subdwarf stars based on the sample of Carney et al. (1994, CLLA). Hipparcos parallaxes, TYC2+HIP proper motions and Tycho2 proper motions were combined with radial velocities and metallicities from C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c815ba2982c728a383337e41cf6c4419
https://doi.org/10.1051/0004-6361:20035829
https://doi.org/10.1051/0004-6361:20035829
Publikováno v:
International Astronomical Union Colloquium. 191:33-36
Population II stars are old, metal-poor, Galactic halo stars with high proper motion. We have carried out a visual binary survey of 164 halo stars in the solar neighborhood (median distance 100 pc), using infrared speckle interferometry, adaptive opt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc60e09c0a70f0194230eddd7f5a5251
https://doi.org/10.1017/s0252921100008393
https://doi.org/10.1017/s0252921100008393
Publikováno v:
Astronomy & Astrophysics. 374:L12-L15
We present the discovery of a previously unknown very nearby star - LHS 2090 at a distance of only d=6 pc. In order to find nearby (i.e. d < 25 pc) red dwarfs, we re-identified high proper motion stars ($��>$ 0.18 arcsec/yr) from the NLTT catalog
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75f8b40ecbe5114e0dd8aa8c6abe6a0e
https://doi.org/10.1051/0004-6361:20010811
https://doi.org/10.1051/0004-6361:20010811