Skip to main content

Spots on the surface of the active late-type star PZ Mon

Buy Article:

$60.90 plus tax (Refund Policy)

Abstract:

The photometric properties of the late-type star PZ Mon are analysed assuming the presence of spots on its surface. The long-term variability in brightness is considered using photographic data together with photoelectric data in the B band. The combined light curve covers the time span from 1898 to 2004 and shows two deep minima which might be interpreted as an activity cycle with a period of 50 years. The investigation of seasonal variations is based on UBVRI observations carried out with the 1.25Âm telescope at the Crimean Astrophysical Observatory in 1992–2004. The derived colours of PZ Mon indicate that the spectral type of the star is K5 and therefore the parameters of spots were calculated adopting a value for the temperature of the photosphere of 4800ÂK. Applying the simple model of star spots we found that a seasonal variability can be produced by spots which cover 17–30% of the hemisphere. The spot temperatures are constant and close to 2700ÂK. If the deep minima on the long-term curve are also produced by the spots, the spotted area should be extended in these epochs to 50%.

Keywords: Red dwarf stars; Stellar activity; Stellar photometry; Stellar spots

Document Type: Research Article

DOI: https://doi.org/10.1080/10556790600918554

Affiliations: Crimean Astrophysical Observatory, Nauchny, Crimea, 98409, Ukraine

Publication date: 2006-04-01

More about this publication?
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more