PDS 144: THE FIRST CONFIRMED Herbig Ae-Herbig Ae WIDE BINARY

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/744/1/54· OSTI ID:22004336

Hornbeck, J B; Williger, G M; Lauroesch, J T ^[1]; Grady, C A ^[2]; Perrin, M D; Grogin, N A ^[3]; Wisniewski, J P; Tofflemire, B M ^[4]; Brown, A ^[5]; Holtzman, J A; Arraki, K ^[6]; Hamaguchi, K ^[7]; Woodgate, B; Petre, R; Bonfield, D G ^[8]; Daly, B ^[9]

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1. Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292 (United States)
2. Eureka Scientific, 2452 Delmer St. Suite 100, Oakland, CA 96402 (United States)
3. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
4. Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States)
5. CASA, University of Colorado, Boulder, CO 80309-0593 (United States)
6. Department of Astronomy, New Mexico State University, Dept 4500, Box 30001, Las Cruces, NM 88003 (United States)
7. CRESST and X-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
8. NASA's Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
9. Department of Astronomy, University of Maryland, College Park, MD 20742-2421 (United States)

PDS 144 is a pair of Herbig Ae stars that are separated by 5.''35 on the sky. It has previously been shown to have an A2Ve Herbig Ae star viewed at 83 Degree-Sign inclination as its northern member and an A5Ve Herbig Ae star as its southern member. Direct imagery revealed a disk occulting PDS 144 N-the first edge-on disk observed around a Herbig Ae star. The lack of an obvious disk in direct imagery suggested PDS 144 S might be viewed face-on or not physically associated with PDS 144 N. Multi-epoch Hubble Space Telescope imagery of PDS 144 with a 5 year baseline demonstrates PDS 144 N and S are comoving and have a common proper motion with TYC 6782-878-1. TYC 6782-878-1 has previously been identified as a member of Upper Sco sub-association A at d = 145 {+-} 2 pc with an age of 5-10 Myr. Ground-based imagery reveals jets and a string of Herbig-Haro knots extending 13' (possibly further) which are aligned to within 7 Degree-Sign {+-} 6 Degree-Sign on the sky. By combining proper motion data and the absence of a dark mid-plane with radial velocity data, we measure the inclination of PDS 144 S to be i = 73 Degree-Sign {+-} 7 Degree-Sign . The radial velocity of the jets from PDS 144 N and S indicates they, and therefore their disks, are misaligned by 25 Degree-Sign {+-} 9 Degree-Sign . This degree of misalignment is similar to that seen in T Tauri wide binaries.

• OSTI ID: 22004336
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 744; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
HERBIG-HARO OBJECTS
INCLINATION
PROPER MOTION
PROTOPLANETS
RADIAL VELOCITY
STARS
TELESCOPES