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HD 178719


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A photometric investigation of RV Tauri and yellow semiregular variables
Results are presented for DDO and UBV photoelectric photometry of 52 RVTau and semiregular variables and candidates. CN abundances, effectivetemperatures, surface gravities, absolute visual magnitudes, and massestimates are derived in the framework of the spectroscopic groupingsproposed by Preston et al. (1963). The photometry suggests a furtherdivision of Preston's group A, and a possible physical connection isindicated between this group and the semiregular variables. Thespectroscopic groups are shown to be well separated in the DDOcolor-color diagrams when mean colors are used for individual stars. Anupper limit of about 3 solar masses is determined for stars in eachgroup. A correlation between derived iron abundances and published IRexcesses obtained from flux measurements at 3.6 and 11.3 microns isfound which supports the contention that dust production incircumstellar shells increases with increasing metallicity.

Light and radial velocity observations of classical Cepheids
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976ApJS...32..399E&db_key=AST

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Kartal
Sað Açýklýk:19h09m42.14s
Yükselim:+01°14'05.0"
Görünürdeki Parlaklýk:8.832
Uzaklýk:84.602 parsek
özdevim Sað Açýklýk:-21.3
özdevim Yükselim:-141.7
B-T magnitude:9.766
V-T magnitude:8.91

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 178719
TYCHO-2 2000TYC 463-1480-1
USNO-A2.0USNO-A2 0900-14043659
HIPHIP 94131

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