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C. A. Grady et al. 2004 ApJ 608 809 doi:10.1086/420763

The Environment of the Optically Brightest Herbig Ae Star, HD 104237a b c d e

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C. A. Grady1, B. Woodgate2, Carlos A. O. Torres3, Th. Henning4, D. Apai4, J. Rodmann4, Hongchi Wang5, B. Stecklum6, H. Linz6, G. M. Williger7, A. Brown8, E. Wilkinson8, G. M. Harper8, G. J. Herczeg8, A. Danks9, G. L. Vieira10, E. Malumuth10, N. R. Collins10 and R. S. Hill10

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Abstract References Cited By

We investigate the environment of the nearest Herbig Ae star, HD 104237, with a multiwavelength combination of optical coronagraphic, near-IR, and mid-IR imaging supported by optical, UV, and far-ultraviolet spectroscopy. We confirm the presence of T Tauri stars associated with the Herbig Ae star HD 104237, noted by Feigelson et al. We find that two of the stars within 15'' of HD 104237 have IR excesses, potentially indicating the presence of circumstellar disks, in addition to the Herbig Ae star itself. We derive a new spectral type of A7.5Ve-A8Ve for HD 104237 and find log(L/Lsun) = 1.39. With these data, HD 104237 has an age of t ≈ 5 Myr, in agreement with the estimates for the other members of the association. HD 104237 is still actively accreting, with a conspicuous UV/far-UV excess seen down to 1040 Å, and is driving a bipolar microjet termed HH 669. This makes it the second, older Herbig Ae star now known to have a microjet. The presence of the microjet enables us to constrain the circumstellar disk to r ≤ 0farcs6 (70 AU) with an inclination angle of i = 18img1.gif from pole-on. The absence of a spatially extended continuum and fluorescent H2 emission near Lyα is in agreement with the prediction of shadowed disk models for the IR spectral energy distribution. With the high spatial density of disks in this group of stars, proximity, and minimal reddening, HD 104237 and its companions should serve as ideal laboratories for probing the comparative evolution of planetary systems.


Footnote
c  Based on observations made with the ESO VLT and the Near-IR Adaptive Optics System+Conica, under program ID 71.C-0143.
Footnote
d  Based on observations made under the ON-ESO agreement for the joint operation of the 1.52 m ESO telescope.
Footnote
e  Based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer. FUSE is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985.
Footnote
a  Based on observations made with the NASA/ESA Hubble Space Telescope, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA Contract NAS5-26555.
Footnote
b  Based on observations made with ESO's TIMMI2 camera on La Silla, Chile, under program ID 71.C-0438.
Subject headings

circumstellar matter; ISM: Herbig-Haro objects; ISM: individual (HH 669); ISM: jets and outflows; planetary systems: protoplanetary disks; stars: individual (HD 104237); stars: pre-main sequence


Dates

Issue 2 (2004 June 20)

Received 2003 December 2, accepted for publication 2004 March 1



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