Home     Getting Started     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astro Photo     The Collection     Forum     Blog New!     FAQ     Press     Login  

HD 84526


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

On the new lambda Bootis-type spectroscopic binary systems HD 84948 and HD 171948
We report the discovery of two new lambda Bootis-type spectroscopicbinary systems (HD 84948 and HD 171948). High resolution spectra wereanalyzed in order to derive abundances as well as astrophysicalquantities. It resulted in extreme (HD 171948) and moderate (HD 84948)underabundances of Na, Mg, Si, Ca, Sc, Ti, Cr and Fe with respect to theSun, thus establishing all four individual stars as true members of thelambda Bootis group. These two systems are therefore the firstspectroscopic binary systems where both components are lambdaBootis-type stars. Furthermore, we have discovered delta Scuti typepulsation for one component of HD 84948 making this star particularlyinteresting for further observations. Since many authors have used therotational velocity for discriminating lambda Bootis stars(vsini>50kms(-1) ), we note that both components of HD 171948 are theslowest (vsini<20kms(-1) ) rotating lambda Bootis-type stars known sofar. Using the Hipparcos data, we are able to rule out thediffusion/mass-loss mechanism as origin for these two systems. Pre- aswell as Main Sequence evolutionary tracks for the age determinationyield consistent results with the predictions of the diffusion/accretiontheory, establishing both systems as being very close to the MainSequence. A determination of the orbital elements and/or anasteroseismological investigation of HD 84948 could provide anindependent proof of our results. Based on observations obtained at theOsservatorio Astronomico di Padua-Asiago, McDonald Observatory, theSierra Nevada Observatory and with the Hipparcos satellite

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:


Observation and Astrometry data

Constellation:Άρκτος Μεγάλη
Right ascension:09h47m16.21s
Declination:+48°02'05.8"
Apparent magnitude:8.54
Distance:251.889 parsecs
Proper motion RA:2.2
Proper motion Dec:-4.5
B-T magnitude:8.756
V-T magnitude:8.558

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 84526
TYCHO-2 2000TYC 3436-413-1
USNO-A2.0USNO-A2 1350-07656218
HIPHIP 48013

→ Request more catalogs and designations from VizieR