Laimons Zacs

Dr. Laimons Zacs Leading Researcher Department of Physics, University of Latvia Raina bulv. 19 Riga, LV-1586 Latvia Phone: +371 7229643 Fax: +371 7225039 E-mail: zacs@latnet.lv

Born: February 25, 1960, Cesis, Latvia

• Astrophysics
• High Resolution Spectroscopy
• Chemically Peculiar Stars (barium, AGB and post-AGB, etc.)
• Chemical Composition of Stellar Atmospheres
• S-process Nucleosynthesis
• Circumstellar Matter

Languages: Latvian, Russian, English, German

• University of Latvia (Faculty of Physics and Mathematics), 1984
• Special course in the field of observational astronomy, Special Astrophysical Observatory, Russian Academy of Sciences, 1988
• Candidate of Science, Special Astrophysical Observatory, Nizhny Arkhiz, Russia, 1992
• Dr.phys., University of Latvia, 1992

• Junior Researcher, Radioastrophysical Observatory, Latvian Academy of Sciences, 1986-1992
• Visiting astronomer, Special Astrophysical Observatory, Russian Academy of Sciences, 1989
• Researcher, Radioastrophysical Observatory, Latvian Academy of Sciences, 1992-1995
• Leading Researcher, Radioastrophysical Observatory, Latvian Academy of Sciences, 1995-1997
• Leading Researcher, Ventspils International Radio Astronomy Centre (VIRAC), 1997-2000
• Leading Researcher, Institute of Atomic Physics and Spectroscopy, University of Latvia, 2001 -

   

• Member, European Astronomical Society, 1994
• Member, VIRAC Council, 1999
• Referee for Astronomy and Astrophysics (A European Journal), EDP Sciences
• Member, Latvian Physical Society
• Advisor of one master and two bachelor theses at the Physics Department of the University of Latvia
• Contributed talk (co-authors A.Alksnis and R. Spelmanis) “CIT6: the early phase of PPN?” - An International workshop “Post-AGB objects (Proto-planetary nebulae) as a phase of stellar evolution”, July 5-7, 2000, Torun, Poland

• Barium- and related stars. Lund Observatory (Prof. Dainis Dravins), Lund University, Sweden, November 1994
• Nucleosynthesis on the AGB: observational aspects. N.Copernicus Astronomical Center (Dr. Ryszard Szczerba), Torun, Poland, April 1996
• Invited review The Chemical Composition and Orbital Parameters of Barium Stars. Symposium No.177 of the International Astronomical Union (IAU) “The carbon star phenomenon”, Antalya, Turkey, May 27-31, 1996
• Complex investigations of PPN: results, problems, future prospects (co-authors M. Schmidt and R. Spelmanis) VIRAC SAC Meeting, Riga and Ventspils, 15-16 June, 1998.

• A few of the observational programs on the 6-m BTA telescope of the Russian Academy of Sciences, Nizhnij Arkhiz, North Caucasus, 1987-1994 (Drs. Vladimir E. Panchuk, Valentina G.Klochkova, Ilfan F.Bikmaev, Gazinur A.Galazutdinov, Faig A.Musaev).
• Institute of Physics and Astronomy (Prof. Poul E. Nissen), University of Aarhus, Denmark, November 1994.
• The observational program at the European Southern Observatory (CAT+CES), Chile (remote control from Headquarters at Garching near Munich, Germany), December 1994.
• Institut d’Astronomie et d’Astrophysique (Dr. Henri M.J.Boffin), Brussels, Belgium.
• N.Copernicus Astronomical Center (Drs. Ryszard Szczerba and Mirek Schmidt), Torun, Poland, June 1997, March 1998, April-May 1999.
• Kazan State University (Drs. Ludmila I.Mashonkina, Ilfan F. Bikmaev), Tatarstan, Russia
• Observatorio Astronomico Nacional (Dr. William J. Schuster), UNAM, Mexico

• L.Zacs. A spectroscopic analysis of barium stars. - Astronomy and Astrophysics, 1994, vol. 283, pp.937-954.
• O.Alksnis, L.Zacs. The violet opacity in the red peculiar stars. II. Spectral analysis of the cool carbon stars WZ Cas and V Cyg. - Astrophysics and Space Science, 1994, vol. 215, pp.73-82.
• H.M.J Boffin, L.Zacs. Examination of the wind accretion scenario for barium stars. -Astronomy and Astrophysics, 1994, vol.291, pp.811-814.
• L.Zacs, V.G.Klochkova, V.E.Panchuk. The chemical composition of post-AGB star, proto-planetary nebulae candidate IRAS 22272+5435 = SAO 34504. - Monthly Notices of the Royal Astronomical Society, 1995, vol.275, pp.764-772.
• L.I.Mashonkina, L.Zacs. On the problem of selective enhancement of barium in the atmospheres of Ba II stars. - Astrophysics and Space Science, 1996, vol.236, pp.185-199.
• L.Zacs, V.G.Klochkova, V.E.Panchuk, R.Spelmanis. The chemical composition of the protoplanetary nebula candidate HD 179821. - Monthly Notices of the Royal Astronomical Society, 1996, vol.282, pp.1171-1180.
• L.Zacs, F.A.Musaev, I.F.Bikmaev, O.Alksnis. An abundance analysis of single-lined spectroscopic binaries with barium stars like orbital elements. I. Analysis and results. -Astronomy and Astrophysics Supplement Series, 1997, vol.122, pp.31-42.
• L.Zacs. Detection of C₂ and C₃ absorption in two post-AGB objects IRAS22272+5435 and CIT6. - Astrophysics and Space Science, 1997, vol. 251, pp.289-292.
• L.Zacs, P.E.Nissen, W.J.Schuster. The chemical composition of HD196944: a carbon and s-process rich, very metal-poor star. - Astronomy and Astrophysics, 1998, vol. 337, pp.216-222.
• L.Zacs, O.Alksnis, F.A.Musaev, I.F.Bikmaev, G.A.Galazutdinov. An abundance analysis of the single-lined spectroscopic binaries with barium stars like orbital elements. II. The spectroscopic data. - Astronomy and Astrophysics Supplement Series, 1999, vol.136, pp.453-454.
• L.Zacs, M.R.Schmidt, R.Szczerba. A search for diffuse absorption bands in the spectra of two PPN candidate stars: HD179821 and SAO34504. - Monthly Notices of the Royal Astronomical Society, 1999, vol.306, pp.903.
• L.Zacs. The chemical composition and orbital parameters of barium stars. – In: IAU Symp. 177: The Carbon Star Phenomenon (ed. R.Wing), Kluwer Academic Publishers, 2000, pp.277-284.
• L.Zacs, M.R.Schmidt, W.J.Schuster. A carbon rich star BD+75r 348: a binary? - Astronomy and Astrophysics, 2000, vol.358, pp.1022-1026.
• L Zacs, R.Spelmanis. The violet opacity in the red peculiar stars. III. Spectral analysis of the SC star GP Ori. – Astrophysics and Space Science, 2001. vol.275, pp.239-246.
• L.Zacs. A detailed spectroscopy of selected peculiar stars in open clusters. – Proceedings of Taiwan-Baltic Workshop “Dynamical and Chemical Evolution of Star Clusters” (Ed. W.P.Chen), Nationa; Centyral University, Chung-Li, 2003, pp.147-159.
• Zacs L., Spelmanis R., Musaev F.A., Galazutdinov G.A. A search for diffuse absorption bands in carbon-rich stars. I. Barium and related stars. – Monthly Notices of the Royal Astronomical Society, Blackwell Science, 2003, vol.339, pp.460-466.
• Zacs L., Schmidt M., Musaev F.A., Galazutdinov G.A., Sperauskas J. A detailed spectroscopy of the search for carbon-rich star BD+57⁰ 2161. – Astronomy and Astrophysics, 2005, vol.441, pp.303-308.
• Schmidt M., Zacs L., Mikolajewska J., Hinkle K. An abundance analysis of the symbiotic star CH Cygni. – Astronomy and Astrophysics, 2006, vol.446, pp.603-609.

• L.Zacs. (Head of Project). Preconditions for the Formation of Barium Stars. C&EE Programme of European Southern Observatory (1993-1994).
• L.Zacs. (Head of Project). The evolutionary link among peculiar red giants. Latvian Council of Science (1995-1996).
• L.Zacs. (Head of Project). Complex investigations of protoplanetary nebulae candidate. Latvian Council of Science (1997-2000).
• L. Zacs (Head of Project). A spectroscopic analysis of AGB objects. Latvian Council of Science (2001-2004).
• L. Zacs (Head of Project). Examination of Neutron-capture Nucleosynthesis in Stars Using High-resolution Spectroscopy. Latvian Council of Science (2005 - ).

Last update 26.10.2007