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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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观测天体数据

星座:天鷹座
右阿森松:19h09m42.14s
赤纬:+01°14'05.0"
视星:8.832
距离:84.602 天文距离
右阿森松适当运动:-21.3
赤纬适当运动:-141.7
B-T magnitude:9.766
V-T magnitude:8.91

目录:
适当名称
HD 1989HD 178719
TYCHO-2 2000TYC 463-1480-1
USNO-A2.0USNO-A2 0900-14043659
HIPHIP 94131

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