Abstract
A fine structure related to the kinematic peculiarities of three components of the Scorpius-Centaurus association (LCC, UCL, and US) has been revealed in the UV-velocity distribution of Gould Belt stars. We have been able to identify the most likely members of these groups by applying the method of analyzing the two-dimensional probability density function of stellar UV velocities that we developed. A kinematic analysis of the identified structural components has shown that, in general, the center-of-mass motion of the LCC, UCL, and US groups follows the motion characteristic of the Gould Belt, notably its expansion. The entire Scorpius-Centaurus complex is shown to possess a proper expansion with an angular velocity parameter of 46 ± 8 km s−1 kpc−1 for the kinematic center with l 0 = −40° and R 0 = 110 pc found. Based on this velocity, we have estimated the characteristic expansion time of the complex to be 21 ± 4 Myr. The proper rotation velocity of the Scorpius-Centaurus complex is lower in magnitude, is determined less reliably, and depends markedly on the data quality.
Similar content being viewed by others
References
V. A. Ambartsumyan, Stellar Evolution and Astrophysics (AN Arm. SSR, Yerevan, 1947) [in Russian].
V. A. Ambartsumyan, Astron. Zh. 26, 3 (1949).
D. Barrado y Navascuées, J. R. Stauffer, et al., Astrophys. J. 520, L123 (1999).
A. Blaauw, Bull. Astron. Inst. Netherland 11, 414(1952).
A. Blaauw, Ann. Rev. Astron. Astrophys. 2, 213(1964).
A. Blaauw, The Physics of Star Formation and Early Stellar Evolution, Ed. by C. J. Lada and N. D. Kylafis (Kluwer, Dordrecht, 1991).
V. V. Bobylev, Pis’ma Astron. Zh. 30, 185 (2004a) [Astron. Lett. 30, 159 (2004a)].
V. V. Bobylev, Pis’ma Astron. Zh. 30, 861 (2004b) [Astron. Lett. 30, 848 (2004b)].
V. V. Bobylev, Pis’ma Astron. Zh. 32, 906 (2006) [Astron. Lett. 32, 816 (2006)].
V. V. Bobylev, G. A. Gontcharov, and A. T. Bajkova, Astron. Zh. 83, 821 (2006) [Astron. Rep. 50, 733 (2006)].
D. Breitschwerdt and M. A. Avillez, Astron. Astrophys. 452, L1 (2006).
J. H. J. de Bruijne, Mon. Not. R. Astron. Soc. 310, 585 (1999).
W. J. B. Corradi, G. A. P. Franco, and J. Knude, Mon. Not. R. Astron. Soc. 347, 1065 (2004).
D. Dravins, L. Lindegren, and S. Madsen, Astron. Astrophys. 348, 1040 (1999).
D. Fernández, F. Figueras, and J. Torra, astroph/0611766 (2006).
B. Fuchs, D. Breitschwerdt, M. A. Avilez, et al., Mon. Not. R. Astron. Soc. 373, 993 (2006).
E. J. de Geus, P. T. de Zeeuw, and J. Lub, Astron. Astrophys. 216, 44 (1989).
G. A. Gontcharov, Pis’ma Astron. Zh. 32, 844 (2006) [Astron. Lett. 32, 759 (2006)].
E. Jilinski, S. Duflon, K. Cunha, et al., Astron. Astrophys. 448, 1001 (2006).
J. R. D. Lépine and G. Duvert, Astron. Astrophys. 286, 60 (1994).
P. O. Lindblad, Astron. Astrophys. 363, 154 (2000).
P. O. Lindblad, P. O. Grape, K. Sandqvist, et al., Astron. Astrophys. 24, 309 (1973).
L. Lindegren, S. Madsen, and D. Dravins, Astron. Astrophys. 356, 1119 (2000).
K. L. Luhman, Astrophys. J. 560, 287 (2001).
T. E. Lutz and D. H. Kelker, Publ. Astron. Soc. Pac. 85, 573 (1973).
S. Madsen, D. Dravins, and L. Lindegren, Astron. Astrophys. 381, 446 (2002).
V. V. Makarov, Astron. J. 126, 1996 (2003).
E. E. Mamajek, Astrophys. J. 634, 1385 (2005).
E. E. Mamajek and E. D. Feigelson, Astron. Soc. Pac. Conf. Ser. 244, 104 (2001).
E. E. Mamajek, W. A. Lawson, and E. D. Feigelson, Astrophys. J. 516, L77 (1999).
E. E. Mamajek, W. A. Lawson, and E. D. Feigelson, Astrophys. J. 544, 356 (2000).
E. E. Mamajek, M. Meyer, and J. Liebert, Astron. J. 124, 1670 (2002).
A. M. Mel’nik, A. K. Dambis, and A. S. Rastorguev, Pis’ma Astron. Zh. 27, 611 (2001) [Astron. Lett. 27, 521 (2001)].
C. A. Murray, Vectorial Astrometry (Adam Hilger, Bristol, 1983; Naukova Dumka, Kiev, 1986).
K. F. Ogorodnikov, Dynamics of Stellar Systems (Pergamon, Oxford, 1965; Fizmatgiz, Moscow, 1965).
C. A. Olano, Astron. Astrophys. 112, 195 (1982).
A. E. Piskunov, N. V. Kharchenko, S. R öser, et al., Astron. Astrophys. 445, 545 (2006).
M. E. Popova and A. V. Loktin, Pis’ma Astron. Zh. 31, 743 (2005) [Astron. Lett. 31, 663 (2005)].
T. Preibisch and H. Zinnecker, Astron. J. 117, 2381 (1999).
M. J. Sartori, J. R. D. Lépine, and W. S. Dias, Astron. Astrophys. 404, 913 (2003).
G. Schaller, D. Schaerer, G. Meynet, et al., Astron. Astrophys., Suppl. Ser. 96, 269 (1992).
J. Skuljan, J. B. Hearnshaw, and P. L. Cottrell, Mon. Not. R. Astron. Soc. 308, 731 (1999).
I. Song, B. Zuckermann, and M. S. Bessel, Astrophys. J. 599, 342 (2003).
The Hipparcos and Tycho Catalogues, ESA SP-1200 (1997).
C. A. O. Torres, L. da Silva, G. R. Quast, et al., Astron. J. 120, 1410 (2000).
C. A. O. Torres, G. R. Quast, L. da Silva, et al., Astron. Astrophys. 460, 695 (2006).
R. Wichmann, J. H. M. M. Schmitt, and S. Hubrig, Astron. Astrophys. 399, 983 (2003).
P. T. de Zeeuw, R. Hoogerwerf, J. H. J. de Bruijne, et al., Astron. J. 117, 354 (1999).
B. Zuckerman, I. Song, and R. A. Webb, Astrophys. J. 559, 388 (2001).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.V. Bobylev, A.T. Bajkova, 2007, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2007, Vol. 33, No. 9, pp. 643–656.
Rights and permissions
About this article
Cite this article
Bobylev, V.V., Bajkova, A.T. Kinematics of the Scorpius-Centaurus OB association. Astron. Lett. 33, 571–583 (2007). https://doi.org/10.1134/S1063773707090010
Received:
Issue Date:
DOI: https://doi.org/10.1134/S1063773707090010