Publication: Rotational modulation of the photospheric and chromospheric activity in the young, single K2-dwarf PW and [asterisks referring to footnotes]
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2003-12
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High resolution echelle spectra of PW And (HD 1405) have been taken during eight observing runs from 1999 to 2002. The detailed analysis of the spectra allow us to determine its spectral type (K2V), mean heliocentric radial velocity (V_hel = - 11.15 km s^-1) rotational velocity (ν sin i = 22.6 km s^-1), and equivalent width of the lithium line λ6707.8 Å (EW(Li I) = 273 mÅ). The kinematic (Galactic Velocity (U, V, W)) confirms its membership in the Local Association moving group, in agreement with the age (30 to 80 Myrs) inferred from the color magnitude diagram and the lithium equivalent width. Photospheric activity (presence of cool spots that disturb the profiles of the photospheric lines) has been detected as changes in the bisectors of the cross correlation function (CCF) resulting of cross-correlate the spectra of PW And with the spectrum of a non-active star of similar spectral type. These variations of the CCF bisectors are related to the variations in the measured radial velocities and are modulated with a period similar to the photometric period of the star. At the same time, chromospheric activity has been analyzed, using the spectral subtraction technique and simultaneous spectroscopic observations of the Hα, Hβ, Na i D_1 and D_2, He I D_3, Mg I b triplet, Ca II H& K, and Ca II infrared triplet lines. A flare was observed during the last observing run of 2001, showing an enhancement in the observed chromospheric lines. A less powerful flare was observed on 2002 August 23. The variations of the chromospheric activity indicators seem to be related to the photospheric activity. A correlation between radial velocity, changes in the CCF bisectors and equivalent width of different chromospheric lines is observed with a different behaviour between epochs 1999, 2001 and 2002.
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© ESO 2003.
Asterisk 1 in title refers to footnote:
Based on observations made with the 2.2 m telescope of the German-Spanish Astronomical Centre, Calar Alto (Almería, Spain), operated by the Max-Planck-Institute for Astronomy, Heidelberg, jointly with the Spanish National Commission for Astronomy, with the Nordic Optical Telescope (NOT), operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway and Sweden, in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias, with the Isaac Newton Telescope (INT) operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias, with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Centro Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias and with the Hobby-Eberly Telescope (HET) operated by McDonald Observatory on behalf of The University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen.
We would like to thank M. Cruz Gálvez for help in the reduction of the observations, Dr. B. H. Foing for allowing us to use the ESA-MUSICOS spectrograph at Isaac Newton Telescope, and Dr. I. Ilyn for help with SOFIN spectrograph during the observations at the Nordic Optical Telescope (NOT). This work was supported by the Universidad Complutense de Madrid and the Spanish Ministerio de Ciencia y Tecnología (MCYT), Programa Nacional de Astronomía y Astrofísica under grant AYA2001-1448.
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Abbott, B. P., Pomerance, B. H., & Ambruster, C. W. 1995, BAAS, 27, 842
Ambruster, C. W., Brown, A., Fekel, F. C., et al. 1994, ASP, 64, 348
Ambruster, C. W., Brown, A., Fekel, F. C., et al. 1998, in The Tenth Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, ed. R. A. Donahue, & J. A. Bookbinder, CD-1205, ASP Conf. Ser., 154
Asiain, R., Figueras, F., Torra, J., & Chen, B. 1999, A&A, 341, 427
Barden, S. C. 1985, ApJ, 295, 162
Ayres, T. R., Stauffer, J. R., Simon, T., et al. 1994, ApJ, 420, L33
Baudrand, J., & Böhm, T. 1992, A&A, 259, 711
Beavers, W. I, & Eitter, J. J. 1986, ApJS, 62, 147
Bidelman, W. P. 1985, AJ, 90, 341
Canfield, R. C., Kiplinger, A. L., Penn, M. J., & Wülser, J. P. 1990, ApJ, 363, 318
Cayrel de Strobel, G., Spite, M. 1988, in The proceedings of the International Astronomical Union, IAUS Symp., 132 (Dordrecht: Kluwer Academic Publishers)
Christian, D. J., Craig, N., Dupuis, J., Roberts, B. A., & Malina, R. F. 2001, AJ, 122, 378
Collier-Cameron, A., & Unruh, Y. 1994, MNRAS, 269, 814
Dempsey, R. C. 1991, Ph.D. Thesis, University of Toledo, Spain
Dempsey, R. C., Bopp, B. W., Strassmeier, K. G., et al. 1992, ApJ, 392, 187
Donati, J.-F., Henry, G. W., & Hall, D. S. 1995, A&A, 293, 107
ESA 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200
Fekel, F. C. 1997, PASP, 109, 514
Fehrenbach, C., & Burnage, R. 1982, A&AS, 49, 483
García López, R. J., Rebolo, R., & Martín, E. L. 1994, A&A, 282, 518
Gray, D. F. 1992, The observation and analysis of stellar photospheres, 2nd ed. (Cambridge University Press)
Griffin, R. F. 1992, Observatory, 112, 41
Gunn, A. G., Doyle, J. G., Mathioudakis M., Houdebine, E. R., & Avgoloupis, S. 1994, A&A, 285, 489
Hall, J. C., & Ramsey, L. W. 1992, AJ, 104, 1942
Hall, J. C. 1996, PASP, 108, 313
Hartmann, L., Hewett, R., Stahler, S., & Mathieu, R. D. 1986, APJ, 309, 275
Houdebine, E. R., Foing, B. H., & Rodonó, M. 1990, A&A, 238, 249
Høg, E., Fabricius, C., Makarov, V. V., et al. 2000, A&A, 355, L27
Hooten, J. T., & Hall, D. S. 1990, ApJS, 74, 225
Hünsch, M., & Reimers, D. 1995, A&A, 296, 509
Kreysing, H.-C., Brunner, H., & Staubert, R. 1995, A&AS, 114, 465
Landini, M., Monsignori Fossi, B. C., Pallavicini, R., & Piro, L. 1986, A&A, 157, 217
López Santiago, J., Montes, D., et al. 2003, in preparation
Malina, R. F., Marshall, H. L., Antia, B., et al. 1994, AJ, 107, 751
Montes, D., Fernández Figueroa, M. J., De Castro, E., & Cornide, M. 1995, A&A, 294, 165
Montes, D., Fernández Figueroa, M. J., De Castro, E., & Sanz Forcada, J. 1997, A&AS, 125, 263
Montes, D., Sanz Forcada, J., Fernández Figueroa, M. J., De Castro, E., & Poncet, A. 1998, A&A, 330, 155
Montes, D., Saar, S. H., Collier Cameron, A., & Unruh, Y. C. 1999, MNRAS, 305, 45
Montes, D., Fernández Figueroa, M. J., De Castro, E., et al. 2000, A&AS, 146, 103
Montes, D., López Santiago, J., Gálvez, M. C., et al. 2001a, MNRAS, 328, 45
Montes, D., López Santiago, J., Fernández Figueroa, M. J., & Gálvez, M. C. 2001b, A&A, 379, 976
Neuhäuser, R., Torres, G., Sterzik, M. F., & Randich, S. 1997, A&A, 325, 647
Pfeiffer, M. J., Frank, C., Baumueller, D., Fuhrmann, K., & Gehren, T. 1998, A&AS, 130, 381
Pallavicini, R., Cerruti Sola, M., & Duncan, D. K. 1987, A&A, 174, 116
Pye, J. P., McGale, P. A., Allan, D. J., et al. 1995, MNRAS, 274, 1165
Rhode, K. L., Herbst, W., & Mathieu, R. D. 2001, AJ, 122, 3258
Rutledge, R. E., Brunner, R. J., Prince, T. A., & Lonsdale, C. 2000, ApJS, 131, 335
Tonry, J., & Davis, M. 1979, AJ, 84 1511
Thomas, H.-C., Beuermann, K., Reinsch, K., et al. 1998, A&A, 335, 467
Rice, J. B., Wehlau, W. H., & Khokhlova, V. L. 1989, A&A, 208, 179
Schmidt-Kaler, T. 1982, in Landolt-Börstein, 2b, ed. K. Schaifers, & H. H. Voig (Heidelberg: Springer)
Siess, L., Duffour, E., & Forestini, M. 2000, A&A, 358, 593
Soderblom, D. R., Oey, M. S., Johnson, D. R. H., & Stone, R. P. S. 1990, AJ, 99, 595
Soderblom, D. R., Jones, B. F., Balachandran, S., et al. 1993, AJ, 106, 1059
Strassmeier, K. G., Hall, D. S., Zeilik, M., et al. 1988, A&AS, 72, 291
Strassmeier, K. G., Hall, D. S., Fekel, F. C., & Scheck, M. 1993, A&AS, 100, 17
Strassmeier, K. G., & Rice, J. B. 1998, A&A, 339, 497
Toner, C., & Gray, D. F. 1988, ApJ, 334, 1008
Tull, R. G. 1998, in the proceedings of SPIE, The International Society for Optical Engineering, 3355, 387
Vogt, S. S., & Penrod, G. D. 1983, ASP, 95, 565
Vogt, S. S., Penrod, G. D., & Hatzes, A. P. 1987, ApJ, 321, 496
Wichmann, R., Schmitt, J. H. M. M., & Hubrig, S. 2003, A&A, 399, 983
Wood, B. E., Ambruster, C. W., Brown, A., & Linsky, J. L. 2000, ApJ, 542, 411