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The HIPPARCOS proper motion of the Magellanic Clouds
Kroupa, Pavel; Bastian, Ulrich
The proper motion of the Large (LMC) and Small (SMC) Magellanic Cloud using data acquired with the Hipparcos satellite is presented. Hipparcos measured 36 stars in the LMC and 11 stars in the SMC. A correctly weighted mean of the data yields the presently available most accurate values, µαcos( δ) = 1.94±0.29 mas/yr, µδ<…
Globular cluster orbits based on Hipparcos proper motions
Tucholke, H. -J.; Brosche, P.; Odenkirchen, M. +1 more
We present and analyse space motions and orbits for a sample of 15 galactic globular clusters. The absolute proper motions of these clusters have been determined with respect to reference stars of the new Hipparcos system. Orbital integrations in two model potentials for the Galaxy are considered.
The sample shows a mean rotation near 40 km s…The Hipparcos distance determination of the Wolf-Rayet system γ2 Velorum (WC8+O) and its ramifications
van der Hucht, K. A.; Moffat, A. F. J.; van den Heuvel, E. P. J. +9 more
Hipparcos parallax measurements give a distance to the Wolf-Rayet WC8+O spectroscopic binary γ2 Vel of d = 258 -31+41 pc and a distance to the O4I(n)f star ξ Pup of d = 429 -77+120pc. Adopting for γ2 Vel an interstellar extinction of Aν = 0.06 mag, this implies an absolut…
The characteristics of the cool component of the cataclysmic binary AE Aquarii derived from its HIPPARCOS parallax
Friedjung, Michael
Observations of the parallax of the cataclysmic binary AE Aqr, using the HIPPARCOS satellite, are combined with the published spectrum and magnitudes in the K band. The radius of the cool component of the binary is probably significantly larger than that of a main sequence star of the same spectral type, though the errors and uncertainties do not …
The host to gamma-ray burst 970508: a distant dwarf galaxy?
Galama, T. J.; Bloom, J. S.; Kouveliotou, C. +6 more
If the optical transient to gamma-ray burst (GRB) 970508 is indeed associated with the 8 May burst and is connected with the z = 0.835 absorption system reported by Metzger et al. (1997) [Natur, 387, 879], then either the GRB originated from an intrinsically very faint galaxy (L ≲ 0.01L∗) or it occurred at a large distance from a host g…
Halo stars, starbursts, and distant globular clusters: A survey of unresolved objects in the Hubble Deep Field
Elson, Rebecca A. W.; Gilmore, Gerard F.; Santiago, Basilio X.
We present a survey of unresolved objects in the Hubble Deep Field. We find 59 such objects with I814≤ 28. Only nine are candidates for low mass ( m ≤ 0.5M ⊙) halo stars. This rules out a steeply rising luminosity function fainter than M v = 12, and precludes low mass stars as a major constituent of halo dark matte…