TY - JOUR
T1 - The environment of the optically brightest Herbig Ae star, HD 104237
AU - Grady, C. A.
AU - Woodgate, B.
AU - Torres, Carlos A.O.
AU - Henning, Th
AU - Apai, D.
AU - Rodmann, J.
AU - Wang, Hongchi
AU - Stecklum, B.
AU - Linz, H.
AU - Williger, G. M.
AU - Brown, A.
AU - Wilkinson, E.
AU - Harper, G. M.
AU - Herczeg, G. J.
AU - Danks, A.
AU - Vieira, G. L.
AU - Malumuth, E.
AU - Collins, N. R.
AU - Hill, R. S.
PY - 2004/6/20
Y1 - 2004/6/20
N2 - 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/L⊙) = 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 ≤ 0″.6 (70 AU) with an inclination angle of z = 18°-11+14 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.
AB - 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/L⊙) = 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 ≤ 0″.6 (70 AU) with an inclination angle of z = 18°-11+14 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.
KW - Circumstellar matter
KW - ISM: Herbig-Haro objects
KW - ISM: individual (HH 669)
KW - ISM: jets and outflows
KW - Planetary systems: protoplanetary disks
KW - Stars: individual (HD 104237)
KW - Stars: pre-main-sequence
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U2 - 10.1086/420763
DO - 10.1086/420763
M3 - Article
AN - SCOPUS:3142715386
SN - 0004-637X
VL - 608
SP - 809
EP - 830
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 I
ER -