dorsal/arxiv
View SchemaResolved Hubble Space spectroscopy of ultracool binary systems
| Authors | E. L. Martin, W. Brandner, H. Bouy, G. Basri, J. Davis, R. Deshpande, M. Montgomery |
|---|---|
| Categories | |
| ArXiv ID | physics/0605042 |
| URL | https://arxiv.org/abs/physics/0605042 |
| DOI | 10.1051/0004-6361:20054186 |
Abstract
Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the \emph{Hubble Space Telescope} (HST), we have obtained spatially resolved spectra of 20 ultracool dwarfs. 18 of them belong to 9 known very low-mass binary systems with angular separations in the range 0.37-0.098 arcseconds. We have derived spectral types in the range dM7.5 to dL6 from the PC3 index, and by comparing our STIS spectra with ground-based spectra of similar spectral resolution from Mart{\'\i}n et al. (1999). We have searched for H$_\alpha$ emission in each object but it was clearly detected in only 2 of them. We find that the distribution of H$_\alpha$ emission in our sample is statistically different from that of single field dwarfs, suggesting an intriguing anticorrelation between chromospheric activity and binarity for M7--M9.5 dwarfs. We provide measuments of the strength of the main photospheric features and the PC3 index, and we derive calibrations of spectral subclasses versus F814W and K-band absolute magnitudes for a subset of 10 dwarfs in 5 binaries that have known trigonometric parallaxes.
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"abstract": "Using the low-resolution mode of the Space Telescope Imaging Spectrograph\n(STIS) aboard the \\emph{Hubble Space Telescope} (HST), we have obtained\nspatially resolved spectra of 20 ultracool dwarfs. 18 of them belong to 9 known\nvery low-mass binary systems with angular separations in the range 0.37-0.098\narcseconds. We have derived spectral types in the range dM7.5 to dL6 from the\nPC3 index, and by comparing our STIS spectra with ground-based spectra of\nsimilar spectral resolution from Mart{\\\u0027\\i}n et al. (1999). We have searched\nfor H$_\\alpha$ emission in each object but it was clearly detected in only 2 of\nthem. We find that the distribution of H$_\\alpha$ emission in our sample is\nstatistically different from that of single field dwarfs, suggesting an\nintriguing anticorrelation between chromospheric activity and binarity for\nM7--M9.5 dwarfs. We provide measuments of the strength of the main photospheric\nfeatures and the PC3 index, and we derive calibrations of spectral subclasses\nversus F814W and K-band absolute magnitudes for a subset of 10 dwarfs in 5\nbinaries that have known trigonometric parallaxes.",
"arxiv_id": "physics/0605042",
"authors": [
"E. L. Martin",
"W. Brandner",
"H. Bouy",
"G. Basri",
"J. Davis",
"R. Deshpande",
"M. Montgomery"
],
"categories": [
"physics.space-ph"
],
"doi": "10.1051/0004-6361:20054186",
"title": "Resolved Hubble Space spectroscopy of ultracool binary systems",
"url": "https://arxiv.org/abs/physics/0605042"
},
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