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HD 61038


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A high-resolution optical and radio study of Milky Way halo gas
Optical interstellar absorption lines of Ti II and Ca II and the 21 cmemission line of H I were observed at high-resolution (6 and 1 km/s,respectively) and high detection sensitivity along 25 lines of sight inthe Galactic halo. The sample includes 16 distant halo stars matchedwith one or more nearly aligned foreground stars as well as local starsalong five extragalactic sight lines. The data show substantialinterstellar material, at both low and intermediate velocities, between250 and 1000 pc beyond the Galactic plane. As much as one-third of thetotal gas observed in Ca II absorption may be beyond 1 kpc, and thegaseous Ti II may lie in an even thicker layer. The directly determinedgaseous Ti abundance above the Galactic plane exceeds that in the disk,on the average, by a factor of 4 to 6 and, for individual cloudcomponents, is further enhanced at higher LSR velocity. Thirty threediscrete high-latitude clouds are detected in Ca II absorption, and 17discrete clouds, including three high-velocity clouds, are identified inH I emission. The kinematics of the high-latitude gas observed in Ti IIand Ca II absorption is characterized by significant peculiar velocitieswith respect to a model corotating halo.

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Observation and Astrometry data

Constellation:Gémeaux
Right ascension:07h37m50.90s
Declination:+14°02'31.1"
Apparent magnitude:6.775
Distance:188.679 parsecs
Proper motion RA:28.7
Proper motion Dec:-93.5
B-T magnitude:6.747
V-T magnitude:6.773

Catalogs and designations:
Proper Names
HD 1989HD 61038
TYCHO-2 2000TYC 777-964-1
USNO-A2.0USNO-A2 0975-05328433
HIPHIP 37136

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