Publication: UV Monochromatic Imaging of the Protoplanetary Nebula Hen 3-1475 Using HST STIS
Loading...
Official URL
Full text at PDC
Publication Date
2018
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
https://www.mdpi.com/
Citations
Exportar
Abstract
Collimated outflows and jets play a critical role in shaping planetary nebulae (PNe), especially in the brief transition from a spherical AGB envelope to an aspherical PN, which is called the protoplanetary nebula (pPN) phase. We present UV observations of Hen 3-1475, a bipolar pPN with fast, highly collimated jets, obtained with STIS on board the Hubble Space Telescope (HST). The deep, low-dispersion spectroscopy enabled monochromatic imaging of Hen 3-1475 in different UV nebular emission lines; this is the first of such attempt ever conducted for a pPN. The northwest inner knot (NW1) is resolved into four components in Mg II λ2800. Through comparison analysis with the HST optical narrowband images obtained 6 yr earlier, we found that these components of NW1 hardly move, despite of a negative gradient of high radial velocities, from −1550 km s−1 on the innermost component to ∼−300 km s−1 on the outermost. These NW1 knot components might thus be quasi-stationary shocks near the tip of the conical outflow of Hen 3-1475.
Description
UCM subjects
Unesco subjects
Keywords
Citation
1. Riera, A.; García-Lario, P.; Manchado, A.; Pottasch, S.R.; Raga, A.C. IRAS 17423-1755: A massive post-AGB star evolving into the planetary nebula stage? Astron. Astrophys. 1995, 302, 137–153.
2. Bobrowsky, M.; Zijlstra, A.A.; Grebel, E.K.; Tinney, C.G.; Hekkert, P.; Van de Steene, G.C.; Likkel, L.; Bedding, T.R. He 3-1475 and its jets. Astrophys. J. Lett. 1995, 446, L89–L92.
3. Borkowski, K.J.; Blondin, J.M.; Harrington, J.P. Collimation of astrophysical jets: The protoplanetary nebula He 3-1475. Astrophys. J. Lett. 1997, 482, L97–L100.
4. Borkowski, K.J.; Harrington, J.P. Kinematics of 1200 kilometer per second jets in He 3-1475. Astrophys. J. 2001, 550, 778–784.
5. Ueta, T.; Meixner, M.; Bobrowsky, M. A Hubble Space Telescope snapshot survey of proto-planetary nebula candidates: Two types of axisymmetric reflection nebulosities. Astrophys. J. 2000, 528, 861–884.
6. SáchezContreras, C.; Sahai, R. A 2000 kilometer per second “pristine” post-asymptotic giant branch wind in the proto-planetary nebula He 3-1475. Astrophys. J. Lett. 2001, 553, L173–L176.
7. Sahai, R.; Kastner, J.H.; Frank, A.; Morris, M.; Blackman, E.G. X-ray emission from the pre-planetary nebula Henize 3-1475. Astrophys. J. Lett. 2003, 599, L87–L90.
8. Riera, A.; García-Lario, P.; Manchado, A.; Bobrowsky, M.; Estalella, R. The high-velocity outflow in the proto-planetary nebula Hen 3-1475. Astron. Astrophys. 2003, 401, 1039–1056.
9. Riera, A.; Binette, L.; Raga, A.C. Shock excitation of the knots of Hen 3-1475. Astron. Astrophys. 2006, 455, 203–213.
10. Gauba, G.; Parthasarathy, M. UV (IUE) spectra of hot post-AGB candidates. Astron. Astrophys. 2003, 407, 1007–1020.
11. Stanghellini, L.; Shaw, R.A.; Mutchler, M.; Palen, S.; Balick, B.; Blades, J.C. Optical slitless spectroscopy of Large Magellanic Cloud planetary nebulae: A study of the emission lines and morphology. Astrophys. J. 2002, 575, 178.
12. Stanghellini, L.; Shaw, R.A.; Balick, B.; Mutchler, M.; Blades, J.C.; Villaver, E. Space Telescope Imaging Spectrograph slitless observations of Small Magellanic Cloud planetary nebulae: A study on morphology, emission-line intensity, andevolution. Astrophys. J. 2003, 596, 997.
13. Velázquez, P.F.; Riera, A.; Raga, C. Time-dependent ejection velocity model for the outflow of Hen 3-1475. Astron. Astrophys. 2004, 419, 991–998.
14. Fang, X.; Gómez de Castro, A.I.; Toalá, J.A.; Riera, A. HST STIS UV spectroscopic observations of the protoplanetary nebula Hen 3-1475. Astrophys. J. Lett. 2018, 865, L23.