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Some Publications using Spectroscopic Observations at HartRAO

• Short-period variability in the Class II methanol maser source G12.89+0.49 (IRAS 18089-1732), Goedhart, S.; Langa, M. C.; Gaylard, M. J.; van der Walt, D. J., 2009, MNRAS, 398, 995.

• Periodic class II methanol masers in G9.62+0.20E, van der Walt, D. J.; Goedhart, S.; Gaylard, M. J., 2009, MNRAS, 398, 961.

• Possible magnetic field variability during the 6.7 GHz methanol maser flares of G09.62+0.20, Vlemmings, W. H. T.; Goedhart, S.; Gaylard, M. J., 2009, A&A, 500, L9.

• Periodic Variations in Class II Methanol Masers, Goedhart, S.; Gaylard, M.; van der Walt, J.; Elitzur, M., 2008, Massive Star Formation: Observations Confront Theory ASP Conference Series, Vol. 387, proceedings of the conference held 10-14 September 2007 at Heidelberg Convention Center, Heidelberg, Germany. Edited by Henrik Beuther, Hendrik Linz, and Thomas Henning. San Francisco: Astronomical Society of the Pacific, p.124

• Forty Years of Radio Astronomy at Hartebeesthoek, 2007, Gaylard, M. J.; Nicolson, G. D., 2007, African Sky, Vol. 11, p.49

• Tick tock - The 12.2 GHz methanol masers in G9.62+0.20, Gaylard, M J.; Goedhart, S, 2007, Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p. 150-151

• Periodic variations in 6.7-GHz methanol masers, Goedhart, S.; Gaylard, M. J.; van der Walt, D. J., 2007, Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p. 97-101

• How do methanol masers manage to appear in the youngest star vicinities and isolated molecular clumps?, Sobolev, A. M.; Cragg, D. M.; Ellingsen, S. P.; Gaylard, M. J.; Goedhart, S.; Henkel, C.; Kirsanova, M. S.; Ostrovskii, A. B.; Pankratova, N. V.; Shelemei, O. V.; van der Walt, D. J.; Vasyunina, T. S.; Voronkov, M. A., 2007, Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p. 81-88

• Very Long Baseline Array imaging of a periodic 12.2-GHz methanol maser flare in G9.62+0.20E, Goedhart S, Minier V, Gaylard M J, van der Walt D J, 2005, MNRAS, 356, 839

• Long-Term Monitoring of 6.7- and 12.2-GHz Methanol Masers, Goedhart S, Gaylard M J, van der Walt D J, 2004, Ap Space Sci 295, 1

• Long-term monitoring of 6.7-GHz methanol masers, Goedhart S, Gaylard M J, van der Walt D J, 2004, MNRAS, 355, 553

• Periodic flares in the methanol maser source G9.62+0.20E, Goedhart S, Gaylard M J, van der Walt D J, 2003, MNRAS 339, L33

• Monitoring of 6-cm excited OH masers-II, Smits, D P, 2003, MNRAS 339, 1

• Methanol maser monitoring at 6.7 and 12.2 GHz, Gaylard M J, Goedhart S, Dhlamini D, 2002, pp127 - 130 in Proc. IAU Symposium 206 Cosmic masers: from protostars to blackholes

• Variability studies of 6.7 GHz methanol masers at HartRAO, Goedhart S, Gaylard M J, Dhlamini D, 2002, pp 131 - 134 in Proc. IAU Symposium 206 Cosmic masers: from protostars to blackholes

• Kinematics of the Gum Nebula Region, Woermann B, Gaylard M J, Otrupcek R, 2001, MNRAS 325, 1213

• Hydroxyl lines towards Puppis A, Woermann B, Gaylard M J, Otrupcek R, 2000, MNRAS 317, 421

• Hydrogen recombination lines from the Gum nebula, Woermann B, Gaylard M J, Otrupcek R, 2000, MNRAS 315, 241

• 6.7 GHz Methanol Masers Associated with IRAS-Selected Sources, MacLeod, G C, van der Walt D J, North, A, Gaylard M J, Galt J A, Moriarty-Schieven G H, 1998, AJ 116, 2936

• OH 4765-MHz maser flares in MON R2, Smits D P, Cohen R J, Hutawarakorn B, 1998, MNRAS 296 L11

• Masers in Massive Star-Forming Regions Associated with the Brightest Steep-Spectrum IRAS Point Sources, MacLeod G C, Scalise E Jr., Saedt S, Galt J A, Gaylard M J, 1998, AJ 116, 1897

• Monitoring of 6-cm excited OH masers, Smits D P, 1997, MNRAS, 287, 253

• Search for 5₁-6₀ A⁺-methanol masers towards faint IRAS sources, van der Walt D J, Retief S J P, Gaylard M J, MacLeod G C, 1996, MNRAS, 282, 1085

• Variable hydroxyl and methanol masers in G351.78-0.54, MacLeod G C, Gaylard M J, 1996, MNRAS, 280, 868

• Spectroscopic research with the Hartebeesthoek telescope, Gaylard M J, MacLeod G C, Smits D P, West M E, van der Walt D J, 1995, Ap. Space Sci, 230, 341

• Pulsation properties of a sample of Mira and OH/IR stars, Gaylard M J, West M E, 1995, ASP Conf. Series 83, 411

• New detections of 5₁-6₀ A⁺-methanol masers towards IRAS sources, van der Walt D J, Gaylard M J, MacLeod G C, 1995, A&AS, 110, 81

• Co-existing with GLONASS: observing the 1612 MHz hydroxyl line, Combrinck W L, West M E, Gaylard M J, 1994, PASP, 106, 807

• 12.2-GHz methanol and 1.6-GHz hydroxyl masers associated with new 6.7-GHz methanol masers, Gaylard M J, MacLeod G C, van der Walt D J, 1994, MNRAS, 269, 257.

• New detections of excited OH masers at 5cm wavelength Smits D P, 1994, MNRAS, 269, L11.

• A search for SiO, OH, CO and HCN radio emission from silicate-carbon stars, Little-Marenin I R, Sahai R, Wannier P G, Benson P J, Gaylard M J, Omont A, 1994, A&A, 281, 451.

• Long term variability in 12.2-GHz 2₀-3_-1 E-methanol masers and new detections towards 6.6-GHz 5₁-6₀ A⁺-methanol masers, MacLeod G C, Gaylard M J, Kemball, A J, 1993, MNRAS, 262, 343

• New detections of 6.6-GHz 5₁-6₀ A⁺-methanol masers towards southern hydroxyl masers, Gaylard M J, MacLeod G C, 1993, MNRAS, 262, 43

• Detection of 35 new 5₁-6₀ A⁺-Methanol Masers Towards IRAS Sources, Schutte A J, van der Walt D J, Gaylard M J, MacLeod G C, 1992, MNRAS 261, 783

• Distance measurements of OH-IR sources, Shepherd M C, West M E, Cohen R J, Gaylard M J, 1992, p. 380 in Astrophysical Masers, eds. A.W. Clegg, G.E. Nedoluha, Springer-Verlag, Berlin

• Methanol masers in the southern Galaxy, MacLeod G C, Gaylard M J, Scalise Jr. E, Hughes V A, 1992, p. 195 in Astrophysical Masers, eds. A.W. Clegg, G.E. Nedoluha, Springer-Verlag, Berlin

• Masers in star-forming regions associated with cold, bright IRAS sources, MacLeod G C, Gaylard M J, Scalise Jr. E, Hughes V A, 1992, p. 116 in Astrophysical Masers, eds. A.W. Clegg, G.E. Nedoluha, Springer-Verlag, Berlin

• Mira and OH/IR maser characteristics and distance determination, West M E, Gaylard M J, Combrinck W L, Cohen R J, Shepherd M C, 1992, PASP Conf. Series 30, 277.

• Detection of 5₁-6₀ A⁺-Methanol masers towards southern galactic OH masers, MacLeod G C, Gaylard M J, 1992, MNRAS 256, 519

• Search and detection of 5₁-6₀ A⁺-methanol masers towards southern Galactic star-forming regions, MacLeod G C, Gaylard M J, Nicolson G D, 1992, MNRAS 254, 1P

• OH maser light curves and distance measurement techniques for OH-IR sources, Shepherd M C, Cohen R J, Gaylard M J, West M E, 1992, pp 78-79 in colloquium proceedings Instabilities in Evolved Super- and Hypergiants, eds. C de Jager & H Nieuwenhuijzen, North-Holland, Amsterdam

• New detections of OH masers associated with massive star-forming regions, MacLeod G C, 1991, MNRAS, 252, 36

• A 13 cm recombination line survey of the southern Galaxy, Gaylard M J 1991, PASP Conference Series 16, 57

• IRAS 07027-7934: the link between OH/IR stars and carbon-rich planetary nebulae, Zijlstra A A, Gaylard M J, te Lintel Hekkert P, Menzies J, Nyman L-A, Schwarz H E, 1991, A&A 243, L9

• OH-IR sources as precursors to protoplanetary nebulae, Shepherd M C, Cohen R J, Gaylard M J, West M E, 1990, Nature 344, 522

• Search for water vapor masers in the direction of IRAS sources associated with HII regions and molecular clouds, Braz M A, Scalise Jr E, Gregorio Hetem J C, Monteiro do Vale J L, Gaylard M J, 1989, A&AS, 77, 465

• OH-IR sources and the Galactic centre distance, Cohen R J, Shepherd M, Gaylard M J, West M E, 1989, p51 in The Center of the Galaxy, ed. M Morris, publ. Reidel, Dordrecht

• The identification of bright OH/IR stars and their mimics, Gaylard M J, West M E, Whitelock P A, Cohen R J, 1989, MNRAS, 236, 247

• OH masers associated with IRAS far-infrared sources Cohen R J, Baart E E, Jonas J L, 1988. MNRAS 231, 205

• Infrared absorption at 9.7um as an OH/IR star predictor, Gaylard M J, Whitelock P A, 1988 MNRAS 235, 123

• Newly discovered methanol masers associated with IRAS sources, Kemball A J, Gaylard M J, Nicolson G D, 1988 Ap J, 331, L37

• 1612 MHz observations of southern IRAS sources, Dollery M E, Gaylard M J, Cohen R J, 1987, p215 in Circumstellar Matter, eds. I Appenzeller, C Jordan, publ. Reidel, Dordrecht

• Comet Halley hydroxyl observations at 18 cm during the transits of the Galactic plane and Centaurus A,Gaylard M J, 1987, p109 in Cometary Radio Astronomy, eds. W M Irvine, F P Schloerb, L E Tacconi-Garman, publ. NRAO, Green Bank, West Virginia

• The HII regions ionized by Sigma and Tau Sco, Gaylard M J, 1984, MNRAS, 211, 339

• Radio observations of the CMa OB1 HII region, Gaylard M J, Kemball A J, 1984, MNRAS 211, 155

• Detection of the H142alpha line from the Barnard Loop, Gaylard M J, 1984, MNRAS, 211, 149