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The kinematics of lithium-rich, active late-type stars: evidence for a low-mass Local Association (1995)
Journal Article
Jeffries, R. D. (1995). The kinematics of lithium-rich, active late-type stars: evidence for a low-mass Local Association. Monthly Notices of the Royal Astronomical Society, 273(3), https://doi.org/10.1093/mnras/273.3.559

An EUV-selected sample of late-type stars has been observed for lithium abundances and radial velocity radiations. It is found that essentially all of the single stars have lithium abundances comparable to or greater than late-type stars in the Pleia... Read More about The kinematics of lithium-rich, active late-type stars: evidence for a low-mass Local Association.

RE 1816+541: a northern hemisphere analogue to the low-mass rapid rotator HK Aqr. (1994)
Journal Article
Jeffries, R., James, D., & Bromage, G. (1994). RE 1816+541: a northern hemisphere analogue to the low-mass rapid rotator HK Aqr. Monthly Notices of the Royal Astronomical Society, 271(2), https://doi.org/10.1093/mnras/271.2.476

Spectroscopic observations of the optical counterpart to the ROSAT Wide Field Camera source RE 1816 + 541 are presented. We find that the counterpart is a chromospherically active, rapidly rotating, dM1-2e star with a
sin
of 61 km s−1. No evide... Read More about RE 1816+541: a northern hemisphere analogue to the low-mass rapid rotator HK Aqr..

BD+22DEG4409 - a Rapidly Rotating Low-Mass Member of the Local Association (1994)
Journal Article
Jeffries, R., Byrne, P., Doyle, J., Anders, G., James, D., & Lanzafame, A. (1994). BD+22DEG4409 - a Rapidly Rotating Low-Mass Member of the Local Association. Monthly Notices of the Royal Astronomical Society, 270(1), 153–172. https://doi.org/10.1093/mnras/270.1.153

We present spectroscopic and photometric observations of BD + 22°4409, a nearby, low-mass star which, on the basis of its Galactic space motions and high EUV-to-bolometric luminosity ratio, has been previously assigned membership of the young kinemat... Read More about BD+22DEG4409 - a Rapidly Rotating Low-Mass Member of the Local Association.

RE 0618 + 7 5 - A very short-period, binary dMe system (1993)
Journal Article
Jeffries, R., Elliott, K., Kellett, B., & Bromage, G. (1993). RE 0618 + 7 5 - A very short-period, binary dMe system. Monthly Notices of the Royal Astronomical Society, 265(1), https://doi.org/10.1093/mnras/265.1.81

We report on the discovery of a new, very short-period, chromospherically active, late-type binary system. Observations performed with the ROSAT Wide Field Camera revealed the EUV source RE 0618 + 75, and subsequent optical spectroscopy identified th... Read More about RE 0618 + 7 5 - A very short-period, binary dMe system.

The Kinematics of Active Late Type Stars Observed by the ROSAT Wide-Field Camera (1993)
Journal Article
Jeffries, R., & Jewell, S. (1993). The Kinematics of Active Late Type Stars Observed by the ROSAT Wide-Field Camera. Monthly Notices of the Royal Astronomical Society, 264(1), https://doi.org/10.1093/mnras/264.1.106

A sample of single, main-sequence late-type stars detected during the ROSAT Wide Field Camera EUV all-sky survey is kinematically investigated. It is confirmed that the galactic velocity dispersion of magnetically active objects, as defined by the ra... Read More about The Kinematics of Active Late Type Stars Observed by the ROSAT Wide-Field Camera.

Prominence activity on the rapidly rotating field star HD 197890 (1993)
Journal Article
Jeffries, R. D. (1993). Prominence activity on the rapidly rotating field star HD 197890. Monthly Notices of the Royal Astronomical Society, 262(2), https://doi.org/10.1093/mnras/262.2.369

Time-resolved H αspectra are presented of the recently discovered, rapidly rotating young field star HD 197890. The observations contain rapid absorption and emission transients that cross the rotationally broadened Hα profile from blue to red on tim... Read More about Prominence activity on the rapidly rotating field star HD 197890.

Gliese 841A - an EUV-selected chromospherically active binary system (1993)
Journal Article
Jeffries, R., & Bromage, G. (1993). Gliese 841A - an EUV-selected chromospherically active binary system. Monthly Notices of the Royal Astronomical Society, 260(1), https://doi.org/10.1093/mnras/260.1.132

We report the discovery of a new short-period, main-sequence, chromospherically active late-type binary system. EUV observations performed by the ROSAT Wide Field Camera have identified the late-type star GL 841A as a possible very active star by vir... Read More about Gliese 841A - an EUV-selected chromospherically active binary system.

The ROSAT Wide Field Camera all-sky survey of extreme-ultraviolet sources. I - The Bright Source Catalogue (1993)
Journal Article
Pounds, K., Allan, D., Barber, C., Barstow, M., Bertram, D., Branduardi-Raymont, G., …Wonnacott, D. (1993). The ROSAT Wide Field Camera all-sky survey of extreme-ultraviolet sources. I - The Bright Source Catalogue. Monthly Notices of the Royal Astronomical Society, 260(1), https://doi.org/10.1093/mnras/260.1.77

The first all-sky survey for cosmic sources of extreme-ultraviolet radiation has been carried out with the UK Wide Field Camera on ROSAT. A first reduction of the survey data has yielded a catalogue of 383 relatively bright EUV sources, forming the W... Read More about The ROSAT Wide Field Camera all-sky survey of extreme-ultraviolet sources. I - The Bright Source Catalogue.

OB Associations
Presentation / Conference
Jeffries, & Wright. OB Associations. Presented at Protostars and Planets VII

OB associations are low-density groups of young stars that are dispersing from their birth environment into the Galactic field. They are important for understanding the star formation process, early stellar evolution, the properties and distribution... Read More about OB Associations.