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HD 127759


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A revised catalogue of delta Sct stars
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The 71st Name-List of Variable Stars
Not Available

The Delta Scuti star HD 127759
The results are reported of six nights of V-band observations of thenewly discovered Delta Scuti variable HD 127759 during April 3-21, 1991and its Stromgren uvby(beta) photometry. The period analysis indicatesthat HD 127759 is a single-sine frequency-dominant pulsation variablewith a frequency of 14.78626 cycle/d and an amplitude of 0.0199 m. Thetimes of maximum are given. The star is located at the blue edge of theDelta Scuti variable instability strip, with T(eff) about 8400 K andM(V) about 0.93 m.

HD 127759: a New delta Scuti Variable
Not Available

HD 127759 is possibly a short period variable.
Not Available

The distance to the high-velocity clouds - Mass infall and galactic disk formation
The high-velocity neutral hydrogen complex C in optical (Ca K)absorption against stars at distances of 1-2 kpc has been detected,confirming a previous tentative detection and placing an upper limit onthe distance to this complex. A similar (though as yet more uncertain)limit is placed to the distance to complex A. No complex is detected inabsorption against any nearby star, effectively ruling out models inwhich the clouds are formed by supershells in the local disk. If thesedistances are representative of the bulk of the high-velocity clouds,the local mass infall rate is 6 x 10 to the -9th solar mass/sq pc/yr,which would supply the disk column density in 10 billion yr. The cloudslie above the bulk of the disk, and it is shown how they may be used tomeasure the pressure of the halo and to place an upper bound on themetagalactic UV flux.

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Dades d'Observació i Astrometria

Constel·lació:Draco
Ascensió Recta:14h30m46.75s
Declinació:+60°46'34.3"
Magnitud Aparent:8.545
Distancia:333.333 parsecs
Moviment propi RA:-9
Moviment propi Dec:3
B-T magnitude:8.738
V-T magnitude:8.561

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 127759
TYCHO-2 2000TYC 4173-735-1
USNO-A2.0USNO-A2 1500-05810383
HIPHIP 70953

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