scholarly journals Cepheid-like Supergiants in the Halo

1985 ◽  
Vol 82 ◽  
pp. 85-88
Author(s):  
D. D. Sasselov
Keyword(s):  
Alternative Explanation ◽  
Normal Population ◽  
Galactic Latitude ◽  
High Galactic Latitude ◽  
Long Period ◽  
Period Variability ◽  
The Galaxy

AbstractThe newly proposed UU Her-type stars are discussed; their main features being long-period variability and high galactic latitude. It is unlikely that the UU Her stars originated in the plane of the galaxy as they are now located more than a kiloparsec above it. An alternative explanation of their normal Population I characteristics must be looked for.

scholarly journals The Transition from Disk to Halo as seen from Correlations between Kinematics and Metallicity

1995 ◽  
Vol 164 ◽  
pp. 391-391
Author(s):  
S. Bartašiūtė
Keyword(s):  
Chemical Properties ◽  
Galactic Latitude ◽  
Kinematic Parameters ◽  
High Galactic Latitude ◽  
Angular Momenta ◽  
The Galaxy ◽  
Color Data ◽  
The Relationship ◽  
Radial Velocity Data ◽  
And Chemical Properties

An investigation has been made to determine the relationship between kinematic and chemical properties of stars covering nearly all population types in the Galaxy. For this purpose, a sample has been taken of about 1150 high-galactic-latitude F–K stars down to V = 14.0, for which photoelectric seven-color data in the Vilnius medium-band system were collected at the Maidanak Observatory in Uzbekistan, Central Asia. Combining the obtained photometric material with the proper motion and radial velocity data enabled us to compute kinematic parameters of the sample stars and then to make plots of the galactic orbital eccentricities, angular momenta, and velocity dispersions versus [Fe/H], with much attention drawn to the region where the transition between the thin disk and halo occurs.

scholarly journals A Search for Radio Pulsars at High Galactic Latitude

2004 ◽  
Vol 218 ◽  
pp. 129-130
Author(s):  
B. A. Jacoby
Keyword(s):  
Neutron Star ◽  
Equation Of State ◽  
Galactic Plane ◽  
Galactic Latitude ◽  
Good Sensitivity ◽  
Radio Pulsars ◽  
High Galactic Latitude ◽  
State Data ◽  
Large Sample ◽  
The Galaxy

We have completed a search for radio pulsars using the Parkes 64 m telescope, covering ∼4500 deg2 between 15° and 30° from the Galactic plane. Each pointing was observed for 265 s with the 13-beam multibeam system at a frequency of 1374 MHz. The signal from each beam was processed by a 96-channel filterbank and sampled every 125 μs, with a bandwidth of 288 MHz. This strategy affords rapid sky coverage and good sensitivity to pulsars with periods as short as 1 ms, whose existence would constrain the neutron star equation of state. Data were analyzed using the workstation cluster at the Swinburne Centre for Astrophysics and Supercomputing. This effort has yielded 26 new pulsars, including seven recycled pulsars. Taken together with the previous Swinburne Intermediate Latitude Pulsar Survey, a total of 95 new pulsars were found over nearly 7500 deg2 of sky between 5° and 30° from the plane of the Galaxy. This large sample of newly discovered objects contains no young pulsars.

scholarly journals The Structural Parameters of the Milky Way

1996 ◽  
Vol 169 ◽  
pp. 707-708
Author(s):  
Roland Buser ◽  
Jianxiang Rong
Keyword(s):  
Milky Way ◽  
Structural Parameters ◽  
Structural Parameter ◽  
Galactic Latitude ◽  
High Galactic Latitude ◽  
Star Count ◽  
The Galaxy ◽  
Color Data ◽  
Parameter Values ◽  
Disk Component

A new homogeneous catalog of photographic RGU star count and three-color data in seven high-galactic latitude fields has been used to determine the structural parameter values from a large number of multi-component population models of the Galaxy. The data provide strong evidence of a prominent thick disk component coexisting with a canonical thin disk and a low-density spheroidal halo.

Long-period variability of oxygen dissolved in Black Sea waters

2017 ◽  
Vol 476 (1) ◽  
pp. 1084-1088
Author(s):  
A. B. Polonsky ◽  
A. A. Kotolypova
Keyword(s):  
Black Sea ◽  
Long Period ◽  
Period Variability

scholarly journals SAO 244567 (HEN1357): A Post-Agb Star which has turned into a Planetary Nebula within the last 20 years

1998 ◽  
Vol 11 (1) ◽  
pp. 358-358
Author(s):  
M. Parthasarathy
Keyword(s):  
Planetary Nebula ◽  
Far Infrared ◽  
Central Star ◽  
Terminal Velocity ◽  
Galactic Latitude ◽  
Iras Source ◽  
High Galactic Latitude ◽  
Alpha Emission ◽  
Early Type Star ◽  
Emission Strength

SAO 244567 (Henl357) (IRAS 17119-5926) is a high galactic latitude (1 = 331°, b = −12°) early type star, originally classified as a B or A type H-alpha emission line star by Henize (1976). It is an IRAS source with far infrared colours similar to planetary nebulae. The IUE ultraviolet spectra obtained during the last eight years show that the central star is rapidly evolving. It is found that the central star of this young PN has faded by a factor of 3 within the last seven eight years. The terminal velocity of the stellar wind has decreased from −3500 km/sec in 1988 to almost zero in 1994. In 1988 the C IV (1550A) line which was a P-Cygni profile with strong absorption component had almost vanished by 1994. The CIII] 1909A emission strength increased markedly within 4 years from 1988 to 1992. The optical spectra obtained since 1990 shows very clearly only the nebular spectrum which is very similar to that of low excitation planetary nebula. The optical spectrum of SAO 244567 obtained in 1971 shows that it was a post-AGB B 1 or B2 supergiant at that time. This result shows that SAO 244567 has turned into a planetary nebula within the last 20 years. Recently Bobrowsky (1994) obtained narrowband optically resolved images in both H-beta and [OIII] 5007A with the HST planetary camera which revealed a well resolved nebula of size 2 seconds of arc. In this paper we discuss the recent new results.

scholarly journals Unexpected circular radio objects at high Galactic latitude

2021 ◽  
Vol 38 ◽  
Author(s):  
Ray P. Norris ◽  
Huib T. Intema ◽  
Anna D. Kapińska ◽  
Bärbel S. Koribalski ◽  
Emil Lenc ◽  
...  
Keyword(s):  
Galactic Latitude ◽  
High Galactic Latitude ◽  
Square Kilometre Array ◽  
Pilot Survey ◽  
The Universe

Abstract We have found a class of circular radio objects in the Evolutionary Map of the Universe Pilot Survey, using the Australian Square Kilometre Array Pathfinder telescope. The objects appear in radio images as circular edge-brightened discs, about one arcmin diameter, that are unlike other objects previously reported in the literature. We explore several possible mechanisms that might cause these objects, but none seems to be a compelling explanation.

scholarly journals Detection of Hα Emission on High Velocity 21 cm Clouds

1990 ◽  
Vol 139 ◽  
pp. 193-198
Author(s):  
Guido Münch ◽  
Eckhart Pitz
Keyword(s):  
High Velocity ◽  
Galactic Latitude ◽  
Emission Rates ◽  
High Galactic Latitude ◽  
Continuum Intensity ◽  
Lyman Continuum ◽  
Local Standard ◽  
Direct Measurements ◽  
Hα Emission ◽  
Local Standard Of Rest

The measurement of Hα emission on two high galactic latitude clouds known to emit 21 cm lines with local standard of rest (LSR) velocities of −50 and −85 km s−1 is reported. The Hα lines have been found nearly at the velocities of the 21 CM features and have emission rates of 0.2 Rayleigh. The diffuse Lyman continuum intensity required to produce HI ionization at the measured rate is in agreement with the direct measurements made with the ultraviolet (UV) spectrometer of the Voyager 2 spacecraft.

The high-galactic-latitude O-type star HD 93521

1977 ◽  
Vol 48 (2) ◽  
pp. 483-489 ◽  
Author(s):  
Margherita Hack ◽  
Nihal Yilmaz
Keyword(s):  
Type Star ◽  
Galactic Latitude ◽  
High Galactic Latitude
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