Skip to main content
SpringerLink
Log in

Photometric Imaging with Distributive Solar Analogy

  • Published:
Astrophysics and Space Science Aims and scope Submit manuscript

Abstract

The multicolor light curves (UBVRI) of HU Vir have been analyzed to study starspots for epochs 1987 and 1989. The term 'photometric imaging' has been used for predicting cool surface spots by photometric data. Assuming the number of spots and the area are about the same for the two hemispheres, the distributive solar analogy is introduced as a tool to constrain free values of spot parameters into unique values. Therefore, final fitting parameters are claimed unique in a sense that they are independent of free initial guesses. The light and color variations of HU Vir are better explained without polar spots. Finally, the spots are found to be ∼ 1600 K cooler than the T∼ 5000 K of this cool subgiant and cover ∼ %13.9 of the total surface at ±8.0 degrees from the equator for the epoch 1987. The spots at the epoch 1989 are found to be ∼ 2040 K cooler covering ∼ % 12.7 area at ± 27°.7 latitudes. Problems of photometric imaging and possible solutions with distributive solar analogy have been discussed.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Al-Naimiy, H.: 1978, Astrophys. Space Sci. 53, 181.

    Article  ADS  Google Scholar 

  • Banks, T.: 1991, Proc. Astron. Soc. Aust. 9, 148.

    ADS  Google Scholar 

  • Banks, T. and Budding, E.: 1990, Astrophys. Space Sci. 167, 221.

    Article  ADS  Google Scholar 

  • Banks, T., Kilmartin, P.M. and Budding, E.: 1991, Astrophys. Space Sci. 183, 309.

    Article  ADS  Google Scholar 

  • Bidelman, W.P.: 1981, Astron. J. 86, 553.

    Article  ADS  Google Scholar 

  • Bopp, B.W. and Evans, D.S.: 1973, Mon. Not. R. Astron. Soc. 164, 343.

    ADS  Google Scholar 

  • Bopp, B.W. and Noah, P.V.: 1980, Publ. Astron. Soc. Pacific 92, 717.

    Article  ADS  Google Scholar 

  • Bruls, J.H.M.J., Solanki, S.K. and Schussler, M.: 1998, Astron. Astrophys. 336, 231.

    ADS  Google Scholar 

  • Budding, E.: 1977, Astrophys. Space Sci. 48, 207.

    Article  ADS  Google Scholar 

  • Budding, E. and Zeilik, M.: 1987, Astrophys. J. 319, 827.

    Article  ADS  Google Scholar 

  • Budding, E. and Zeilik, M.: 1995, Astrophys. Space Sci. 232, 355.

    Article  ADS  Google Scholar 

  • Byrne, P.B.: 1996, in: G. Klaus, Strassmeier and Jeffrey L. Linsky (eds.), IAU Symposium No.176, Stellar Surface Structure, Kluwer, Dordrecht, p. 299.

    Google Scholar 

  • Claret, A., Diaz-Cordoves, J. and Gimenez, A.: 1995, Astron. Astrophys. Suppl. 114, 247.

    ADS  Google Scholar 

  • Collins, G.W. and Truax, R.J.: 1995, Astrophys. J. 439, 860.

    Article  ADS  Google Scholar 

  • Cutispoto, G.: 1990, Astron. Astrophys. Suppl. 84, 397.

    ADS  Google Scholar 

  • Cutispoto, G.: 1993, Astron. Astrophys. Suppl. 102, 655.

    ADS  Google Scholar 

  • Dempsey, R.C., Bopp, B.W., Strassmeier, K.G., Granados, A.F., Henry, G.W. and Hall, D.S.: 1992, Astrophys. J. 392, 187.

    Article  ADS  Google Scholar 

  • Diaz-Cordoves, J., Claret, A. and Gimenez, A.: 1995, Astron. Astrophys. Suppl. 110, 329.

    ADS  Google Scholar 

  • Donati, J.F., Brown, S.F., Semel, M., Rees, D.E., Dempsey, R.C., Matthews, J.M., Henry, G.W. and Hall, D.S.: 1992, Astron. Astrophys. 265, 682.

    ADS  Google Scholar 

  • Dorren, J.D.: 1987, Astrophys. J. 320, 756.

    Article  ADS  Google Scholar 

  • Dorren, J.D., Siah, M.J., Guinan, E.F. and McCook, G.P.: 1981, Astron. J. 86, 592.

    Article  ADS  Google Scholar 

  • Eaton, J.A., Henry, G.W., Bell, C. and Okorogu, A.: 1993, Astron. J. 106, 1181.

    Article  ADS  Google Scholar 

  • Eker, Z.: 1994, Astrophys. J. 420, 373.

    Article  ADS  Google Scholar 

  • Eker, Z.: 1995, Astrophys. J. 445, 526.

    Article  ADS  Google Scholar 

  • Eker, Z.: 1996, Astrophys. J. 473, 388.

    Article  ADS  Google Scholar 

  • Eker, Z.: 1999, Astrophys. J. 512, 386.

    Article  ADS  Google Scholar 

  • Fekel, F.C., Hall, D.S. and Henry, G.W.: 1984, Inf. Bull. Variable Stars, No. 2543.

  • Fekel, F.C., Moffett, T.J. and Henry, G.W.: 1986, Astrophys. J. Suppl. 60, 551.

    Article  ADS  Google Scholar 

  • Hall, D.S. and Henry, G.W.: 1992, Inf. Bull. Variable Stars, No. 3693.

  • Hall, D.S., Henry, G.W. and Sowell, J.R.: 1990, Astron. J. 99, 396.

    Article  ADS  Google Scholar 

  • Hatzes, A.P.: 1993, Astrophys. J. 410, 777.

    Article  ADS  Google Scholar 

  • Hatzes, A.P.: 1995, Astron. J. 109, 350.

    Article  ADS  Google Scholar 

  • Hatzes, A.P.: 1998, Astron. Astrophys. 330, 541.

    ADS  Google Scholar 

  • Hatzes, A.P., Vogt, S.S., Ramseyer, T.F. and Misch, A.: 1996, Astrophys. J. 469, 808.

    Article  ADS  Google Scholar 

  • Hatzes, A.P. and Vogt, S.S.: 1992, Mon. Not. R. Astron. Soc. 258, 387.

    ADS  Google Scholar 

  • Heckert, P.A. and Ordway, J.I.: 1995, Astron. J. 109, 2169.

    Article  ADS  Google Scholar 

  • Hempelmann, A., Hatzes, A.P., Kurster, M. and Patkos, L.: 1997, Astron. Astrophys. 317, 125.

    ADS  Google Scholar 

  • Kang, Y.W. and Wilson, R.E.: 1989, Astron. J. 97, 848.

    Article  ADS  Google Scholar 

  • Kurster, M., Schmitt, J.H.M.M. and Cutispoto, G.: 1994, Astron. Astrophys. 289, 899.

    ADS  Google Scholar 

  • La Fauci, G. and Rodono, M.: 1983, in: P. Byrne and M. Rodono (eds.), IAU Colog. 71, Activity in Red Dwarfs, Reidel, Dordrecht, 185.

    Google Scholar 

  • Olah, K. and Pettersen, B.R.: 1991, Astron. Astrophys. 242, 443.

    ADS  Google Scholar 

  • Olah, K., Budding, E., Kim, H.J. and Etzel, P.B.: 1994, Astron. Astrophys. 291, 110.

    ADS  Google Scholar 

  • Patkos, L. and Hempelmann, A.: 1994, Astron. Astrophys. 292, 119.

    ADS  Google Scholar 

  • Poe, C.H. and Eaton, J.A.: 1985, Astrophys. J. 289, 644.

    Article  ADS  Google Scholar 

  • Rice, C.B.: 1996, in: G. Klaus, Strassmeier and Jeffrey L. Linsky (eds.), IAU Symposium No. 176, Stellar Surface Structure, Kluwer, Dordrecht, p. 19.

    Google Scholar 

  • Samec, R.G., Su, W., Terrel, D. and Hube, D.P.: 1993, Astron. J. 106, 318.

    Article  ADS  Google Scholar 

  • Schussler, M.: 1996, in: G. Klaus, Strassmeier and Jeffrey L. Linsky (eds.), IAU Symposium No. 176, Stellar Surface Structure, Kluwer, Dordrecht, p. 269.

    Google Scholar 

  • Schussler, M. and Solanki, S.K.: 1992, Astron. Astrophys. 264, L13.

    ADS  Google Scholar 

  • Schussler, M., Caligari, P., Ferriz-Mas, A., Solanki, S.K. and Stix, M.: 1996, Astron. Astrophys. 314, 503.

    ADS  Google Scholar 

  • Stawikowski, A. and Glebocki, R.: 1994, Acta Astron. 44, 393.

    ADS  Google Scholar 

  • Stauffer, J.R., Dorren, J.D. and Africano, J.L.: 1986, Astron. J. 91, 1443.

    Article  ADS  Google Scholar 

  • Strassmeier, K.G.: 1990, Astrophys. J. 348, 682.

    Article  ADS  Google Scholar 

  • Strassmeier, K.G.: 1994, Astron. Astrophys. 281, 395.

    ADS  Google Scholar 

  • Strassmeier, K.G.: 1996a, Astron. Astrophys. 314, 558.

    ADS  Google Scholar 

  • Strassmeier, K.G.: 1996b, in: G. Klaus, Strassmeier and Jeffrey L. Linsky (eds.), IAU Symposium No. 176, Stellar Surface Structure, Kluwer, Dordrecht, p. 289.

    Google Scholar 

  • Strassmeier, K.G.: 1997, Astron. Astrophys. 319, 535.

    ADS  Google Scholar 

  • Strassmeier, K.G. and Bopp, B.W.: 1992, Astron. Astrophys. 259, 183.

    ADS  Google Scholar 

  • Strassmeier, K.G., Fekel, F.C., Bopp, B.W., Dempsey, R.C. and Henry, G.W.: 1990, Astrophys. J. Supl., 72, 191.

    Article  ADS  Google Scholar 

  • Strassmeier, K.G., Rice, J.B., Wehlau, W.H., Hill, G.M. and Matthews, J.M.: 1993, Astron. Astrophys. 268, 130.

    Google Scholar 

  • Strassmeier, K.G., Rice, J.B., Wehlau, W.H., Vogt, S.S., Hatzes, A.P., Tuominen, I., Pikunov, N.E., Hackman, T. and Poutanen, M.: 1991, Astron. Astrophys. 247, 130.

    ADS  Google Scholar 

  • Summers, D.L. and Heckert, P.A.: 1997, Astron. J. 113, 2242.

    Article  ADS  Google Scholar 

  • Torrez, C.A.O. and Ferraz Mello, S.: 1973, Astron. Astrophys. 27, 231.

    ADS  Google Scholar 

  • Unruh, Y.C.: 1996, in: G. Klaus, Strassmeier and Jeffrey L. Linsky (eds.), IAU Symposium No. 176, Stellar Surface Structure, Kluwer, Dordrecht, p. 35.

    Google Scholar 

  • Unruh, Y.C. and Cameron, A.C.: 1995, Mon. Not. R. Astron. Soc. 273, 1.

    ADS  Google Scholar 

  • Unruh, Y.C. and Cameron, A.C.: 1997, Mon. Not. R. Astron. Soc. 290, L37.

    ADS  Google Scholar 

  • Vogt, S.S.: 1981, Astrophys. J. 250, 327.

    Article  ADS  Google Scholar 

  • Vogt, S.S. and Hatzes, A.P.: 1996, in: G. Klaus, Strassmeier and Jeffrey L. Linsky (eds.), IAU Symposium No. 176, Stellar Surface Structure, Kluwer, Dordrecht, p. 245.

    Google Scholar 

  • Vogt, S.S., Penrod, G.D. and Hatzes, A.P.: 1987, Astrophys. J. 321, 496.

    Article  ADS  Google Scholar 

  • Zeilik, M., Cox, D.A., De Blasi, C., Rhodes, M. and Budding, E.: 1989, Astrophys. J. 345, 991.

    Article  ADS  Google Scholar 

  • Zeilik, M., Gordon, S., Jaderlund, E., Ledlow, M., Summers, D.L., Heckert, P.A., Budding, E. and Banks, T.S.: 1994, Astrophys. J. 421, 303.

    Article  ADS  Google Scholar 

  • Zeilik, M., Ledlow, M., Rhodes, M., Arevalo, M.J. and Budding, E.: 1990, Astrophys. J. 354, 352.

    Article  ADS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. College of Science, Department of Astronomy, King Saud University, P.O.Box 2455, Riyadh, 11451, Saudi Arabia

    Zeki Eker & Mohammed Al-Malki

Authors
  1. Zeki Eker
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Mohammed Al-Malki
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Eker, Z., Al-Malki, M. Photometric Imaging with Distributive Solar Analogy. Astrophysics and Space Science 262, 411–439 (1998). https://doi.org/10.1023/A:1001822424864

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1023/A:1001822424864

Keywords

Search

Navigation