Long-Period Variables and Carbon Stars in the Galactic Bulge

1993 ◽  
pp. 39-56 ◽  
Author(s):  
Patricia Whitelock
Keyword(s):  
Galactic Bulge ◽  
Carbon Stars ◽  
Long Period ◽  
Long Period Variables

scholarly journals Long-period variables and carbon stars in the Galactic Bulge

1993 ◽  
Vol 153 ◽  
pp. 39-56 ◽  
Author(s):  
Patricia Whitelock
Keyword(s):  
Globular Clusters ◽  
Galactic Bulge ◽  
Carbon Stars ◽  
Instability Strip ◽  
Long Period ◽  
Wide Range ◽  
Evolutionary Phase ◽  
Binary Evolution ◽  
M Stars ◽  
Different Parts

The review covers the properties of red variables in globular clusters and the Galactic Bulge. Details are given of our current understanding of the Mira evolutionary phase. There is evidence that Miras in the LMC and the Bulge occupy different parts of the instability strip but obey the same PLC relation. The Bulge contains at least 2 × 104 Miras of which 100 or so have luminosities in excess of Mbol = — 5 mag. The Mira phase lasts more than 105 yr. These objects originate from stars with a wide range of metallicity, but it is currently unclear if the most metal-rich stars reach the top of the AGB to become Miras. Preliminary data suggest that the distribution of the Miras along the minor axis of the Bulge is different from that of the late-M stars but similar to the 2.4 μm luminosity.Our knowledge of the Bulge carbon stars is briefly reviewed. It is suggested that, by analogy with the carbon-rich dwarfs, these stars are probably best understood as the products of binary evolution.

scholarly journals Long-period variables in the Sgr I field of the Galactic Bulge

1995 ◽  
Vol 273 (2) ◽  
pp. 383-400 ◽  
Author(s):  
I. S. Glass ◽  
P. A. Whitelock ◽  
R. M. Catchpole ◽  
M. W. Feast
Keyword(s):  
Galactic Bulge ◽  
Long Period ◽  
Long Period Variables

scholarly journals Observations of Mass Loss and Circumstellar Matter around Cool Carbon Stars

2000 ◽  
Vol 177 ◽  
pp. 367-375 ◽  
Author(s):  
T. Lloyd Evans
Keyword(s):  
Circumstellar Matter ◽  
Dust Formation ◽  
Infrared Photometry ◽  
Carbon Stars ◽  
Absorption Bands ◽  
Long Period ◽  
Resonance Emission ◽  
Long Period Variables ◽  
Circumstellar Gas ◽  
Semiregular Variable

Spectroscopy and infrared photometry of carbon stars show three distinct forms of circumstellar matter. IRAS 12311-3509 probably has an edge-on disk and the spectrum is dominated by resonance emission from atoms and molecules in the vicinity. The long-period variables V Hya and R Lep are undergoing deep fadings, apparently caused by dust formation around the star, while variable emission from circumstellar gas is seen. The semiregular variable T Mus showed absorption bands from very cool material during an unusual episode in 1994.

Carbon Abundances in Planetary Nebulae in the Galactic Bulge

1984 ◽  
Vol 5 (4) ◽  
pp. 535-537
Author(s):  
B. Louise Webster
Keyword(s):  
Globular Clusters ◽  
Planetary Nebulae ◽  
Open Clusters ◽  
Red Giants ◽  
Galactic Bulge ◽  
Long Period ◽  
Long Period Variables ◽  
Galactic Globular Clusters ◽  
The Masses ◽  
K Giants

The galactic nuclear bulge is a well defined population, but it is one that is relatively difficult to study in detail because its members never stray into the solar vicinity and they are both distant and obscured. Mould (1982) has summarized much of our knowledge of the masses and composition of stars in the bulge. The red giants resemble those in metal-rich old open clusters and the late M giants are either younger than galactic globular clusters or super-metal-rich or both. Whitford and Rich (1983) have demonstrated the existence of K-giants that are super-metal-rich in iron and Wood and Bessell (1983) have interpreted the properties of a sample of long period variables in the bulge as those of a young, super-metal-rich population.

scholarly journals Investigation of Long-Period Variables in the Catalina Southern Catalog: New Carbon Stars and False Objects

Astrophysics ◽  
2019 ◽  
Vol 62 (2) ◽  
pp. 202-209
Author(s):  
N. Mauron ◽  
K. S. Gigoyan ◽  
K. K. Gigoyan ◽  
L. P. A. Maurin ◽  
T. R. Kendall
Keyword(s):  
Carbon Stars ◽  
Long Period ◽  
Long Period Variables

scholarly journals Long-period Variable Stars Near the Galactic Centre

1999 ◽  
Vol 191 ◽  
pp. 523-528 ◽  
Author(s):  
I.S. Glass ◽  
S. Matsumoto ◽  
B.S. Carter ◽  
K. Sekiguchi
Keyword(s):  
Variable Stars ◽  
Galactic Centre ◽  
Galactic Bulge ◽  
Long Period ◽  
Four Seasons ◽  
Ir Stars ◽  
Long Period Variables ◽  
Period Variable

A second report on our 4-year survey for long-period variables (LPVs) in the central 24 × 24 arcmin2 of the Galactic Bulge is presented. All four seasons of data have now been reduced and ∼ 350 variables have been found. Preliminary periods have been obtained for most of them. Fifty-five out of 103 known OH/IR stars in the field have been recovered in the K-band.

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